OSI Systems Inc

NASDAQ:OSIS

Earnings Call Analysis

Strong Start to Fiscal Year 2025

OSI Systems kicked off fiscal year 2025 with impressive first-quarter results. The company reported a remarkable 23% year-over-year increase in revenues, reaching a record $344 million. This growth was heavily driven by the Security division, which saw a 36% rise in revenue. The results reflect the company's solid footing in the market, amidst ongoing demand for security solutions across various sectors.

Record Earnings and Backlog

The company also achieved a record non-GAAP adjusted earnings per share (EPS) of $1.25 during the quarter. Additionally, OSI ended the quarter with a robust backlog of approximately $1.8 billion, bolstered by strong bookings. This healthy backlog and extensive pipeline of opportunities provide visibility and confidence for sustained growth throughout fiscal 2025.

Performance by Division

Examining the divisions, the Security segment significantly contributed to the overall success, supported by cargo and vehicle inspection product sales. This division has seen sustained contracts, such as a $500 million-plus contract with Mexico’s defense agency and a $200 million contract with an international customer. Whereas Healthcare revenue remained stable, the Opto division reported an 8% increase driven mainly by operations in Mexico.

Strategic Acquisition and Financial Maneuvers

In September, OSI completed a strategic acquisition within its Security division, which, while not immediately significant to Q1 revenues, is expected to enhance non-GAAP earnings per share for fiscal 2025. Furthermore, the company conducted a convertible financing generating $350 million, which will lower borrowing costs and enhance liquidity, enabling future strategic initiatives and share repurchase activities.

Impressive Margin Performance

Despite a challenging environment influenced by foreign exchange rates, OSI managed to maintain a gross margin of 35.3%, slightly down from the previous year. Its non-GAAP adjusted operating margin increased to 10.3% from 9.6% year-over-year, showcasing effective cost management across its divisions.

Future Guidance and Projections

Looking ahead, OSI raised its fiscal 2025 revenue guidance to a range of $1.67 billion to $1.695 billion, now expecting year-over-year growth of 8.5% to 10.2%. The non-GAAP adjusted EPS guidance has also been increased to $9 to $9.30, reflecting a growth estimate of 10.7% to 14.4% compared to the prior year. This update is underpinned by confidence stemming from the robust backlog and the recently made acquisition.

Management Outlook and Transition

Deepak Chopra, the CEO, announced his upcoming retirement, with plans to transition to the role of Executive Chairman at the end of the calendar year. This leadership change is hoped to usher in a new chapter for OSI as it continues to leverage its innovative product pipeline and global outreach.

Risks and Considerations

While OSI enjoys strong growth momentum, it must remain vigilant regarding potential market uncertainties, inflation impacts, and supply chain disruptions. These factors could affect the timing of revenue conversion from backlog to recognized income, challenging the company's targeted financial outcomes.

Earnings Call Transcript 2025-Q1

[Operator]

Thank you for standing by, and welcome to the OSI Systems First Quarter 2025 Conference Call. [Operator Instructions]. As a reminder, today's program is being recorded. And now I'd like to introduce your host for today's program, Alan Edrick, Executive Vice President and Chief Financial Officer of OSI. Please go ahead, sir.

[Alan Edrick, executive]

Well, thank you. Good morning, and thank you for joining us. As said, I'm Alan Edrick, Executive Vice President and CFO of OSI Systems, and I'm here today with Deepak Chopra, OSI's President and CEO. Welcome to the OSI Systems Fiscal '25 First Quarter Conference Call. We are pleased that you can join us as we review our financial and operational results. Earlier today, we issued a press release announcing our fiscal '25 first quarter financial results.

Before we discuss these results, however, I would like to remind everyone that today's discussion will include forward-looking statements, and the company wishes to take advantage of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 with respect to such forward-looking statements.

All forward-looking statements made on this call are based on currently available information, and the company undertakes no obligation to update any forward-looking statement based on subsequent events or new information or otherwise.

During today's call, we will refer to both GAAP and non-GAAP financial measures when describing the company's results. For further information regarding non-GAAP measures and comparable GAAP measures of the company's results and a quantitative reconciliation of those figures, please refer to today's earnings press release.

I will begin with a high-level summary of our financial performance for the first quarter of fiscal 2025, and then turn the call over to Deepak for a discussion of our business and our operational performance. We will then finish with more detail regarding our financial results, and a discussion of our updated outlook for fiscal year '25.

Following our fiscal '24 financial performance, featuring record revenues and non-GAAP EPS, we started fiscal '25 by posting record Q1 financial results, led by the Security division, resulting in robust year-over-year revenue growth and a significant increase in year-over-year operating income. We are encouraged by the momentum reflected in our Q1 financial performance.

So I'll start with a high-level summary of our fiscal '25 Q1 results. First, revenues increased 23% year-over-year to a Q1 record of $344 million, driven by the performance in our Security division, where Q1 revenues were up 36% year-over-year.

Second, the significant revenue growth led to record Q1 non-GAAP adjusted earnings per share of $1.25.

Third, Bookings were again solid, and we ended the quarter with a backlog of approximately $1.8 billion.

Our healthy backlog and robust pipeline of opportunities provide good visibility going forward. Fourth, we completed a convertible net financing in July, raising gross proceeds of $350 million, which reduced our weighted average cost of borrowings and was immediately accretive. Concurrent with this transaction, we repurchased approximately 531,000 shares of our common stock.

And finally, in September, we completed a strategic bolt-on acquisition in our Security division. While the acquired business did not significantly enhance our Q1 revenues, this deal is expected to be accretive to fiscal '25 non-GAAP earnings per share.

Before diving more deeply into our financial results, and discussing the updated fiscal '25 outlook, I will turn the call over to Deepak.

[Deepak Chopra, executive]

Thank you, Alan, and good morning to everybody, and afternoon. I'm pleased with the company's robust fiscal 2025 first quarter performance. As Alan mentioned, we achieved an impressive 23% revenue growth, leading to a higher year-over-year operating margin. We closed the quarter with a backlog near all-time high of $1.8 billion and are optimistic about the remainder of fiscal 2025 and beyond.

So let's dive into the performance and highlights of each of our 3 divisions for the first quarter, beginning with the Security division, where Q1 revenues were up 36% year-over-year resulting in increased operating profits. Also, security bookings were solid. During the quarter, we continued to deliver on port and border security initiatives with Mexico's defense agency, SEDENA on the $500 million-plus contract and with the other international customer on the $200 million contract.

In addition, shortly after the quarter end, we announced the commencement of operations of our turnkey screening services in Uruguay, utilizing our cargo and vehicle inspection systems along with our proprietary search, scan and integration platform. We will also provide on this contract ongoing management training, equipment maintenance and support as part of the Uruguay contract.

The Uruguay program now joins a list of our long-standing successful multiyear turnkey projects in Puerto Rico, Albania and Guatemala and serves as further evidence for potential customers of the breadth of our capabilities to manage large-scale security programs in various parts of the world.

During Q1, we had several wins in security, and announced these during the quarter. First, a $17 million international order to provide Eagle P60 high-energy drive-through cargo and vehicle inspection systems and T60 trailer-mounted vehicle inspection systems, including maintenance, service and support.

Second, a $26 million services order from an international customer to maintain and service its existing installed base of cargo and vehicle inspection systems.

Third, a $10 million order from yet another international customer to provide the Z Backscatter van, ZBV mobile cargo and vehicle inspection systems, including training, service and support.

And finally, domestically, we announced a contract of order of about $27 million for maintenance, services and technology support what is installed base of Rapiscan cargo and vehicle inspection systems. The agreement contains potential options for orders totaling up to $117 million over a 3-year period.

In Aviation, we continue to make progress on our existing international airport project awards as airports expand and upgrade existing infrastructure, especially in Europe, Middle East and Latin America. Our overall activity at airports and air cargo facilities continues to be robust. We have a good pipeline. We are also focused on developing new offerings for airports and air cargo customers such as providing employee screening solutions for these customers.

In some instances, this could be opportunities for complete turnkey services or hardware sales with remote monitoring services possibility. As Alan mentioned, during the first quarter of fiscal '25, we acquired a U.S.-based company that provides high-power radio frequency-based transmission and amplification solutions for critical military communication, space communications, navigation and surveillance applications, both in the U.S. and international customers.

Like our company's legacy offerings, these products help provide security and safety for people and critical infrastructure. We work with numerous defense and security agencies that utilize this technology in communication and surveillance solutions.

In summary, this acquisition adds proven radio frequency-based technology and products to our portfolio, allowing us to leverage further our global manufacturing sales and service support infrastructure.

Overall, the Security division had a strong start in fiscal 2025, and we look forward to Security, again, achieving a high level of performance for the balance of '25 and beyond.

Moving to the Optoelectronics and Manufacturing division. Opto reported revenues of $98 million, including intercompany sales to reach a new first quarter record, while delivering solid profitability. We saw notable strength and growth in our flex circuits product line. Many of our customers for flex circuits are from consumer tech and advanced medical device industries.

We also have many customers who are leading OEMs in defense electronics. To that end, we announced a $5 million order for advanced optical sensors that the customer will integrate into its complex navigation and guidance systems. I should note here that an order of this size is relatively large for this division.

Our operations in Mexico, which we began at the end of Q2 last year are ramping up as we continue to introduce our existing and potential customer base to its capabilities and the net benefits of nearshoring. The uncertainty and risk for OEMs with China-centric supply chains have never been more significant and our global manufacturing presence in U.S., Mexico, U.K., India, Indonesia and Malaysia provides a viable alternative to reducing these risks.

Finally, on to the Healthcare division. Q1 sales were down slightly year-over-year due to challenging market conditions, as we have mentioned before. Still, the division delivered improved profitability in part due to a more streamlined infrastructure.

To support our customers, this division continues to offer innovative solutions and market its differentiation offerings like the Rothman Index base predictive analytics software and safe and sound patient alarm management software. We are focused on developing the next generation of patient monitoring solutions and continue to progress accordingly, with an improved cost structure and a growing opportunity pipeline. We expect Healthcare's performance to improve over the balance of fiscal '25.

In summary, with a significant backlog and a clear path to near-term opportunities, we are increasingly confident about our prospects for fiscal 2025 and beyond. Our strategy of being a vertically integrated supplier with a flexible and responsive global footprint that meets its customers' needs while we continue to invest in and acquire strategic technologies and capabilities has created a robust business with a long-term sustainable growth potential.

Finally, as you know, I have announced my retirement from my position as Chief Executive Officer of the company at the end of calendar 2024. Though I will remain as Executive Chairman of the Board. In 1987, we laid the foundation for what would become OSI systems, starting as an Opto Sensors Inc. company and embarked on a new chapter by going public in 1997. From the beginning, our mission has been unwavering to deliver essential components and systems that enhance the safety and health of society.

With the seasoned expertise of our current OSI management team, I'm confident in our ability to ascent to even more significant achievements. We expect to announce a successor before the end of the quarter. As such, this is expected to be my last earnings call as CEO, and it has been my privilege to lead the company over the past years and I look forward to supporting OSI's journey going ahead.

With that, I turn the call over to Alan to talk in more detail about our financial performance and updated guidance before opening the call for questions. Thank you.

[Alan Edrick, executive]

Thank you, Deepak. Now I will review in greater detail the financial results for the fiscal '25 first quarter. Again, Q1 revenues were up 23% compared with revenues in the first quarter of the prior fiscal year. This increase was primarily driven by our largest division, Security. The 36% year-over-year increase in Q1 Security division revenues was led by strong growth in our cargo and vehicle inspection product sales, as well as solid growth in our aviation and checkpoint product sales.

Q1 revenues included continued shipments from the $200 million-plus cargo contract announced in January '23 and also from the $500 million-plus cargo contract announced in March '23. In addition, year-over-year Security division services revenues increased 11%.

Third-party Opto sales were solid, delivering an 8% year-over-year increase driven by growth from our new Mexico operations. We continue to see certain Opto customers adjusting inventory levels and ordering patterns which we anticipate seeing through the second quarter of fiscal '25 and perhaps a little beyond.

And revenues in the Healthcare division in the first quarter '25, as Deepak mentioned, we're roughly the same as Q1 revenues in the last fiscal year. The fiscal '25 Q1 gross margin of 35.3% was in line with the 35.4% gross margin in Q1 of last fiscal year, and up sequentially from the 32.1% in Q4 of fiscal '24. Our gross margin will generally fluctuate from period to period based on revenue mix and volume, impacts of changes in supply chain costs and inflation generally, among other factors.

Moving to operating expenses. We continue to work diligently across each of our divisions to improve efficiency and manage our SG&A cost structure. Q1 SG&A expenses were $72 million or 21.0% of sales compared to $60 million or 21.4% of sales in Q1 of the prior year. The year-over-year dollar increase in costs resulted primarily from higher compensation costs in support of the company's growth and the weakening of the U.S. dollar, creating unfavorable foreign exchange rates.

Research and development expenses in Q1 of fiscal '25 were $17.8 million or 5.2% of revenues, compared to $15.9 million or 5.7% of revenues in the same prior year quarter. We continue to dedicate considerable resources to R&D, particularly in our Security and our Healthcare divisions as we remain focused on innovative product development, which we view as vital to the long-term success of our businesses. We recorded $1.2 million of restructuring and other charges in Q1 of fiscal '25, compared to $0.5 million in the same quarter of the prior year.

Moving to interest and taxes. Net interest and other expenses in Q1 increased to $7.4 million in fiscal '25 and from $5.7 million in fiscal '24, primarily due to a higher amount of borrowings, partially offset by the favorable impact of the convertible notes issued during Q1, which were partially used to repay higher cost borrowers.

Our reported effective tax rate under GAAP was 21.9% in Q1 of fiscal '25, compared to 23.4% in Q1 last year. Excluding the impact of discrete tax items, our normalized effective tax rate, which is the rate reflected in our calculation of non-GAAP adjusted EPS was 24% in Q1 of fiscal '25, compared to 25.8% in Q1 of '24.

I will now turn to a discussion of our non-GAAP adjusted operating margin. Overall, our adjusted operating margin in the first quarter of fiscal '25 increased to 10.3% from 9.6% in Q1 of fiscal '24. The Q1 fiscal '25 non-GAAP adjusted operating margin of 14.4% in the Security division was up slightly from the comparable prior year quarter and included the absorption of the notable adverse FX.

The adjusted operating margin in our Opto division was 12.0% in the first quarter of fiscal '25, compared to 12.8% in last year's Q1. Excluding the adverse impact of FX in the Opto division, the margin was relatively in line year-over-year. The Healthcare division reported a nominal increase in its adjusted operating margin.

Moving to cash flow. Cash used in operations in the first quarter was $37 million, primarily in relation to higher inventories and receivables in support of the Security division's revenue growth. CapEx in the first quarter was $7.7 million, while depreciation and amortization expense in Q1 was $11.5 million.

With respect to cash flow, I wanted to take a moment to provide some additional accounting insight on our receivables and DSO, both of which have risen primarily due to our significant international security contracts. Under GAAP, we typically recognize revenue as we ship or deliver products depending upon the specific contractual obligations. The civil works, we typically recognize revenue over time as we complete the construction phase and ultimately install the products.

On certain contracts, like our significant international security contracts we earlier referenced, billing is triggered by the achievement of certain project milestones, which are highly influenced by the customers' time line and sign off. As such, an unbilled receivable is recorded as we recognize revenue under GAAP, but billing and the resulting cash collection occur subsequent to the achievement of the milestone. Therefore, the elevated AR and DSO is normal course for large government contracts, does not factor into the cash economics of the transactions and is just timing related.

Our goal is to collect cash as early as we can, and the trends for typical billed receivables remain strong as DSO for billed receivables is approximately 87 days. We anticipate operating cash flow could be quite significant in the second half of fiscal '25 and potentially even stronger in fiscal '26.

Our balance sheet is solid, with net leverage of about 2.3x as calculated under our credit facility. Aside from $7.5 million of annual required principal repayments under our bank term loan, the bulk of our debt matures in fiscal '27. As mentioned earlier, during Q1, we issued $350 million of convertible notes with a coupon of 2.25% due in fiscal '30 and an initial conversion price of approximately $192.

The proceeds were used to partially pay down our bank revolver and to repurchase approximately 531,000 shares of our common stock as well as cover transaction costs. This transaction provides enhanced liquidity to capitalize on future strategic initiatives while simultaneously being immediately accretive given the significant reduction in interest costs and a reduction in our share count.

As a result of completion of the convertible notes deal and partial paydown of our bank debt and the interest rate swap we entered into approximately 2 years ago, over 70% of our debt was fixed versus floating at the end of Q1.

Finally, turning to guidance. We are updating our fiscal '25 revenues and non-GAAP diluted EPS guidance. For fiscal year '25, we anticipate revenues in the range of $1.67 billion to $1.695 billion, increasing our guidance on year-over-year revenue growth from a range of 5.3% to 7.2% to a range of 8.5% to 10.2% growth. We are also increasing fiscal '25 non-GAAP adjusted earnings per diluted share guidance to a range of $9 to $9.30 per share or 10.7% to 14.4% growth.

This fiscal '25 non-GAAP diluted EPS guidance excludes potential impairment, restructuring and other charges, amortization of acquired intangible assets and their associated tax effects as well as discrete tax and other nonrecurring items. We currently believe this guidance reflects reasonable estimates. The actual impact on the company's financial results of timing changes on the expected conversion of backlog to revenues, disruptions in the supply chain and inflation is difficult to predict and could vary significantly from the anticipated impact currently reflected in our guidance. Actual revenues and non-GAAP EPS could also vary from the guidance indicated above due to other risks and uncertainties discussed in our SEC filings.

We continue to remain focused on the growth of our businesses. We believe our efforts will enable OSI to continue providing innovative products and solutions. We would like to take this opportunity to thank the global OSI team for its continued dedication in supporting our customers and partners. And as a lifelong Dodgers fan, while we respect the Yankees I must conclude with Go Dodgers. At this time, we will open the call to questions.

[Operator]

Certainly. And our first question for today comes from the line of Josh Nichols from B. Riley.

[Josh Nichols, analyst]

Go Dodgers, indeed. I guess just looking at this, I wanted to get a little bit more color. I mean this is actually usually the seasonally slower quarter, particularly in Europe in the later summer months, but the Security backlog is doing quite well. The overall backlog actually kind of increased $100 million sequentially. I know you announced $80-plus million or so, like security awards during the quarter, but you did have about [ $0.25 ] billion as security revenue.

Could you provide just a little bit more granularity on what's been driving that backlog growth overall despite it being a little bit seasonally slower as we kind of touched on?

[Alan Edrick, executive]

Sure, Josh, this is Alan. Great question. So yes, we've seen strength in our Security division. And you're right, with sometimes a typically slower seasonal quarter on the revenue side. we really saw strength across our businesses. We saw it across the geographies, the Americas, Asia Pacific and the EMEA region. We saw strength across our product lines in the aviation and the cargo and solutions. So it was really a nice bookings quarter for us, positioning us with an excellent backlog as we look out to the rest of fiscal '25 and beyond.

[Josh Nichols, analyst]

And then just kind of curious, you're clearly the lead horse when you look at security, cargo vehicle inspection. You did note that you're seeing good revenue as well as opportunities on aviation and things like that as well. What's the opportunity do you think to potentially increase size and market share on that piece of the business where you're still probably like the #2, #3 player into the lead player like you are on traditional cargo and vehicle inspection systems?

[Deepak Chopra, executive]

Good question again. This is Deepak here. Definitely, we see good pipeline, strong expectations in the aviation and air cargo space, primarily into the international sector. As I mentioned, in Latin America, in Asia and in Europe, everywhere there is much more traffic of passengers going, which is making the airports get to the next level of upgrading their systems.

At the same time, we have said many times before on our calls, air cargo is a very focused space for us, and we continue to grow in that business. And our idea also is that we want to do something different, innovative what I said -- mentioned, employee screening both at the airports and air cargo freight facilities.

So all that adds up to, in our opinion, that whole area will continue to see growth, and we are well positioned into it. At the same time, I know that people ask us about the U.S., we are working with TSA. And whenever the next replacement cycle comes in, we'll be ready.

[Josh Nichols, analyst]

Then just last question for me, just touching on the acquisition, good to see the company adding some RF to the product portfolio. I know you described it as a bolt-on acquisition. So I assume it's not going to be a huge contributor to revenue or EPS for this year. But if you could provide any additional color on that?

And then also expectations in terms of potential synergies or how you could layer this into your global footprint for sales and manufacturing and potentially ramp up sales or expand margins on that front?

[Deepak Chopra, executive]

Again, good question. As you know that our strategy is that we look at 1 plus 1 must make more than 2. This is a strategic acquisition. It's a little different technology, but it fits very well in because the same customers that this company works with, we work with the same customers, both domestically and international. And with our footprint being larger, we expect that we'll be able to put this together and be able to go after a much broader customer base.

At the same time, with our service support, with our manufacturing, it definitely has synergy into it. But more important into it, it broadens our technology platform, which is what we've been doing for the last decade or so to broaden our product portfolio.

[Josh Nichols, analyst]

I appreciate Deepak and congratulations again.

[Operator]

And our next question comes from the line of Mariana Perez Mora from Bank of America.

[Mariana Perez Mora, analyst]

Deepak, congratulations on the professional journey and also on the more or like partial retirement, I guess. So my first question is about the pipeline. And I understand for competitive reasons, you cannot give like a lot of like granularity into it. But like how should we think about the pipeline of opportunities in the next, call it, like 6 months or 12 months? And is there like particular like, I don't know, big contracts there that we should be watchful for specific regions? Like how should we think about that?

[Deepak Chopra, executive]

Well, again, good question, but you also answered it, too, that we can't be very specific. Basically, we have been saying for a long time, we consider ourselves in the cargo space as a leading company. We are very much focused on to it domestically, with CBP and other State Department and other customers there. Internationally, with the broad base that we have, there's a lot of activity.

And the other thing that it's tough to say it. But as the world becomes more unsafe, requires more security awareness, and we have the products for that and we have a very broad reach. So we look at this as a very strong pipeline, very strong globally. And with our name and our reputation, and our turnkey services in various parts of the world, we definitely get invited to every dance there is.

[Mariana Perez Mora, analyst]

So if I were to -- let me ask it in a different way. If I were to assume about like 50% of your backlog is going to convert into the next like 12 months. And then the services or a piece of that -- of the aftermarket that you're going to support is not there. I'm still missing about like, what, like around like 1/4 of the revenues that you need to still like get into contracts? Like the -- how strong is the pipeline compared to that?

[Deepak Chopra, executive]

Very strong. And all the time, we've been saying it, these kind of contracts take longer years and time, the bigger the size it is. So we've been working with these customers for a long time. And with our reputation and our success in U.S. and Mexico and other places, we feel very good about it that these things will mature in a timely fashion.

[Mariana Perez Mora, analyst]

What are the key risks that you're looking at in terms of like timing of those opportunities?

[Deepak Chopra, executive]

Would you repeat it again? I didn't get the last -- what you said.

[Mariana Perez Mora, analyst]

What are the key risks that could delay some of these opportunities?

[Deepak Chopra, executive]

Key risks?

[Mariana Perez Mora, analyst]

Key risk.

[Deepak Chopra, executive]

Well.

[Mariana Perez Mora, analyst]

Any challenges, yes.

[Deepak Chopra, executive]

Well, obviously, the economy, the world economy is always a potential risk. But besides that, from time to time, things can change unrest there or something else there, government funding. So I don't see any specific risk, history speaks for itself.

We already are in this unrest both in Middle East and in the Ukraine and Russia area. Our requirement, our pipeline has not weakened. We continue to look at it. And as I mentioned, as you go what is called the other side of the coin, not Security, as you look at what is called people are moving away from China, they want to set up manufacturing in other parts of the world. We have the product and the infrastructure to be there for ports and borders, for crossings for airports, air cargo. So we look at that, we don't look at it as any risk anywhere.

[Mariana Perez Mora, analyst]

Great. And then let me double tap into what you just mentioned, but not only from a Security point of view, but from the Optoelectronics type of opportunity. You mentioned this like $5 million order that you received. Could you please give us some color around the demand, especially in the U.S. or the U.K. for this type of like niche sensors or electronics.

[Deepak Chopra, executive]

Again, good question. So the reason we mentioned that $5 million is a significant order. That's in the Optoelectronics side. Those are components and subassemblies that we make for other OEMs and what we mentioned is that, that pipeline is a very reliable pipeline because we are designed into those customers, in the medical industry, in aerospace industry, defense industry, consumer industry so that we have a very good foresight into that pipeline.

And our customer base is very strong and our manufacturing global in Malaysia, Indonesia, India, U.K., that helps us very much in the new facility in Mexico as people start looking at more alternate to China, so that looks like, again, a good opportunity and a good strong visibility.

[Mariana Perez Mora, analyst]

And last one from me on the receivables. Thank you for the color on the unbilled receivables that when you think about like future contracts, considering these like accounting issues, but also that you're actually transferring some of your assets? Like -- is there any way you can like request earlier payment or a down payment from these international customers in contracts that are these large or how that works?

[Alan Edrick, executive]

Yes, Mariana, this is Alan. Great 3 questions. We have very often in the past requested considerable advances and down payments, which helped defray some of the inventory buildup and some of the AR. When we can get that? We absolutely do.

There are certain contracts that go out by RFP where we cannot really dictate terms. The terms are kind of dictated by the customers in those regards. And if they make good strong economic sense for us to take the contract, even though it might require some adverse cash flow on a short-term basis, we will go ahead and proceed with that. But whenever we can get customer advances or can negotiate payment terms that are more favorable to us, we absolutely do. We're keenly in tune with that.

[Operator]

And our next question comes from the line of Matt Akers from Wells Fargo.

[Matthew Akers, analyst]

Yes. I guess following up on the working capital and thanks for the color, Alan. I guess, is there a target we should think about getting back to like days of receivables or sort of however you want to frame it. I'm just trying to think if there's an opportunity to get back to kind of the level of receivables we were at 2, 3 years ago? Or has something in the business change that maybe that's going to linger a little bit higher than it had been in the past?

[Alan Edrick, executive]

Yes. Good question, Matt. This is Alan. Yes, we do believe that we can get back to the DSO levels that we had experienced in the past, as you mentioned. A big part of the higher DSO and unbilled receivable relates to the big Mexico contract, the SEDENA contract that we referred to. And while that's a great contract from us from a sales and an earnings perspective and a great beachhead for us, it does have those milestones where the cash flow isn't necessarily as strong.

We'll certainly look to get more contracts like that in the future, and that could have an adverse impact on our DSO from time to time. But if you look at us from a historical perspective, we operate generally speaking, in a relatively narrow band of DSO that is much lower than where it is today, and we would anticipate kind of returning to that norm in the future.

[Matthew Akers, analyst]

Yes. Got it. Okay. And I guess on the Healthcare business, nice -- good to see the profit up even with sales kind of flattish. Is there -- I guess you talked a little bit about how you got there? And should we see kind of a similar benefit year-over-year for the rest? I know there's some seasonality in there, but kind of a similar kind of uptick.

[Alan Edrick, executive]

Yes, Matt, this is Alan. You're right. So seasonally speaking, the healthcare business is slowest in the Q1 in the September quarter. So as Deepak mentioned in his earlier remarks, we do expect improved performance through the rest of the year. The way we got to stronger profits on similar or slightly down revenues was also the initiatives that Deepak referred to, where we enhance the operational infrastructure and took out some costs.

The healthcare business for us is the highest contribution margin business. So as revenues go up, there's an awful big pull-through to operating income and EBITDA. So as we do anticipate revenues being stronger in future quarters than they were in Q1, coupled with the leaner cost structure that we have, there's a really nice opportunity for some nice margin expansion.

[Matthew Akers, analyst]

Yes. Got it. I guess if I could squeeze in one more. I guess the acquisition, maybe I missed this, but is it possible to size that? Or at least, I guess, if we think about the guidance raise kind of was most of that organic or was sort of the acquisition, a big chunk of that?

[Alan Edrick, executive]

Sure. Good question. The guidance raised really factored in our increasing confidence in the outlook, which was based upon the strong bookings along with the contributions from the security acquisition that you just mentioned, partly offset on the earnings side by forecasted increase and some interest costs and maybe some general conservatism based on market uncertainty. But the guidance raise was a factor of the acquisition and increased confidence in our overall business.

[Operator]

And our next question comes from the line of Larry Solow from CJS Securities.

[Lawrence Solow, analyst]

Great. And first of all, Deepak congratulations. It's been a good almost 10-year run for us working with you, and I wish you best a luck in the transition. I'm sure you're not going anywhere so fast, but best a luck to you.

Just following up on the first -- that last question, Alan, just on the acquisition. I know you increased guidance by $0.15. Just any more granularity? Is the acquisition like half of that increase? And is it most of the increase? Just trying to get a little more specifics on that, if you can.

[Alan Edrick, executive]

Sure. So the acquisition did contribute to both the top line increase and the bottom line increase. I mentioned earlier that the acquisition is expected to be accretive to us in fiscal '25. And we probably went a little bit conservative as we get to know the business even better. But yes, you could say that the increase in guidance was split between the acquisition as well as just our greater confidence in our own organic business.

[Lawrence Solow, analyst]

Okay. Fair. And then just on the bookings and the backlog, I think it seems like it grew about $100 million from the end of the year over the last quarter. Can you just give us any [ ground ] just specifically, I imagine most of it was security. Is the -- was the book-to-bill above 1 in the quarter? Any more color on that?

[Alan Edrick, executive]

Sure. So good strong bookings by the Security business. The book-to-bill was approximately 1 for the quarter, grew a little bit associated with some acquired backlog as well. The growth in the backlog was really entirely attributable to our Security business.

[Lawrence Solow, analyst]

Got you. And you mentioned the margin, which I think was up a little bit year-over-year or roughly flat on an adjusted basis in just Security. But I think you did mention there was down a few sort of one-timers or nonrecurring things. Did I hear that correctly?

[Alan Edrick, executive]

Really, the main item that adversely impacted our operating margin, both in Security and in Opto and then, of course, with [indiscernible] in OSI with FX, with the weakening dollar that had an adverse effect on us this quarter and not to an significant amount. But we were able to absorb all that and still report what we believe to be a very strong results. So I think there's some upside to that based upon what happens in FX in the future.

[Lawrence Solow, analyst]

Got you. And just on the service portion, I know a nice increase. I think revenue grew 11%. Again, that's mostly Security, I think. Do we expect that service kind of piece to continue to kind of perhaps even grow faster than product revenue, well, assuming you don't get much, hopefully, you get big larger deals going forward, too. But in the near term, that service piece sort of maybe grow faster as some of these contracts -- some of these newly installed things come off warranty and whatnot, you get more of that service piece kicking in? Is that sort of fair to say? Any thoughts on that?

[Alan Edrick, executive]

Yes. Larry, it's Alan. Excellent insight and good question. You're right. Our product revenue growth was far superior to our service revenue growth last year and even into Q1, as we've been fulfilling some of these large contracts.

But as we do fulfill them when they start rolling off of warranty, the service revenue really significantly increases. So you're right, there's a very good chance that our service revenue growth, nice recurring revenue, we'll grow through the balance of the year at a faster clip than our product revenue. Now of course, we hope to get some new, very nice-sized product revenue deals too and fully expect we will. But you're right, it will -- we do expect to see an acceleration of our service revenue growth.

[Lawrence Solow, analyst]

Got it. And then just if I can squeeze one more in just on the Opto piece. I know you mentioned still some inventory management. But actually, I think it looks like if we kind of adjust out for the intersegment sales, we had some pretty nice growth in the quarter. I think revenue would have been -- grew 8%, right, all in there on an external basis, is that, which is a pretty nice growth rate. Do you expect that to continue through the year?

And the second part of that question, it looks like margin was a little offset, and that was a little bit down. Is there anything to read into that?

[Alan Edrick, executive]

Sure. It's Alan again. So good questions, sort of 2 things on the Opto. On the revenues, you're right, the 8% external revenue growth was fantastic. I think we're still seeing some inventory rightsizing and corrections by our customers. So I think that number will moderate here as we move into Q2. But as we move into the second half of the year, we expect stronger sales growth in Opto.

In terms of the margin, the margin impact on Opto similar to Security in some sense, was impacted by FX where we had some notable FX hit in Opto. Outside of that, our operating income in Opto increased as well. So we would expect to see improved operating profits in the Opto business, particularly as we hit the back half of the year as well.

[Operator]

Our next question comes from the line of Christopher Glynn from Oppenheimer.

[Christopher Glynn, analyst]

First off, Deepak, congratulations on your pending transition and the success of the company here. I had a question on the Opto segment. Are you seeing any end markets as you try to look through reshoring, near shoring and inventory adjustment switch, that pattern must be getting a little long in the tooth. Are you seeing any actual like end demand or customer production start to see any cyclical recovery?

[Deepak Chopra, executive]

Well, if I understand your question, we don't see any end of any of our big products in Opto. Is that what the question is?

[Alan Edrick, executive]

No, no, the end markets.

[Christopher Glynn, analyst]

Any end markets starting to move favorably from a cyclical perspective?

[Deepak Chopra, executive]

Yes, we are -- you want to answer it, I didn't understand it.

[Alan Edrick, executive]

Sure. Sure. Chris, this is Alan. Yes, we are seeing some strength in defense. So we're seeing some strength in the defense markets, maybe some continued softness in the medical markets with OEMs. But overall, probably strength in the defense and the other markets being a bit more neutral.

[Deepak Chopra, executive]

Just to add on it, now that I understand it. Again, even in the Opto area, we have a very good product line support for the Defense business. And as there is more unrest in the world, that puts a little bit more requirement for optoelectronic products for various defense equipment that is being asked for in these places. So we look at it that our Opto defense business has seen some good pipeline growth and looks like a good forecast going forward.

[Christopher Glynn, analyst]

Great. And on the -- putting the acquisition aside on the organic component of the raised revenue guidance. Is that more reflecting the pacing of Mexico or the other international? Or some of the activity on the normal kind of shorter lead time projects?

[Alan Edrick, executive]

Sure. Chris, good question. This is Alan. It's really more on the other part of the business. I wouldn't say any of our increase really relates to Mexico. It's much more of the other strong business that we do throughout the world in our various product lines in the security business.

[Operator]

[Operator Instructions]. Our next question comes from Jeff Martin from ROTH Capital Partners.

[Jeff Martin, analyst]

I wanted to dive in a little more on Aviation. It was interesting that you talked about remote monitoring capabilities. Do you see that being a near-term driver? Is that more of an intermediate to longer-term driver?

[Deepak Chopra, executive]

I think it's a question of intermediate to longer term. We have some pilot projects already in the making. And just like what we did in the cargo side and the turnkey business, these kind of products take some time. And we had a control room that we are doing remote monitoring of the employee screening. We are looking at some -- talking to some airports for their employee screening. So the answer is, it's a longer term.

And again, we think that this is a good potential, and we are capable of doing it. We have the strength and the technology behind it, learning from the cargo side. So that just looks like a good product line to -- a good product to go after.

[Jeff Martin, analyst]

Okay. And then respect -- with respect to the RF technology acquisition, help us understand strategically how RF fits into your existing product line? How much market opportunity this might open up? And is this something that you felt was lacking within your product portfolio that you needed to pursue?

And then secondarily, could you just generally comment on the M&A environment, if there's an acceleration potentially forthcoming for OSI? I know you've been opportunistic with your M&A historically, but just curious if you expect M&A to be a more prominent contributor in the next couple of years here.

[Deepak Chopra, executive]

Good question, Jeff. First, the answer to your first question. On this particular acquisition, was a product line that is not in our other products. We looked at that as a complementary because we cater to the same customers, both domestically and internationally. So we looked at it and said this technology fits very well into a broader portfolio so that we can offer a broader service and be able to get to customers where this company had the product.

And by the way, they have a proprietary products that they can sell, but they don't have the size. We have the size and we have the infrastructure globally. So this fitted very well into it, that we could go back and go to a broader base and grow the business.

Reverse of that, they are in certain customers where we think that now that we are in that we can sell some of the other products that we had come into the same customer base. So that way, it gives us what we call 1 plus 1 is more than 2 and we can grow the business as it grows.

[Jeff Martin, analyst]

With respect to the second part of that question, M&A going forward. It seems like you've got significant potential to layer in leverage in the model from both the sales and manufacturing side of things. Is that something you foresee being more prominent contributor going forward?

[Deepak Chopra, executive]

We've always looked at it. Like Alan mentioned, we have a good strong balance sheet. We have a very big focus to look at it, but we are very selective. It must make sense 1 plus 1 more than 2. We continue to look at it. Are there opportunities? We are not going to say this specifically, but we keep looking at a broader pick area all the time. And to answer to your question, focus is going to be more focused on the Security side than the other side, but we also look at the Opto side.

[Jeff Martin, analyst]

Great. And then last one for me. Alan, if you could comment a little more detail on the guidance relative to maybe a shift, pushed the ride of your free cash flow expectations. I mean you do have significant working capital to unwind here. But just curious if you can quantify perhaps the EPS impact current guidance versus previous guidance with respect purely to the interest expense?

[Alan Edrick, executive]

Yes. Good question, Jeff. I would say that there was probably a $0.05 to $0.10 impact to the additional borrowings and the cash flow moving a little bit to the right to our overall EPS guidance that we just provided, which compared to what we provided in our previous call.

[Operator]

Thank you. This does conclude the question-and-answer session of today's program. I'd like to hand the program back to Deepak Chopra for any further remarks.

[Deepak Chopra, executive]

I wanted to thank everybody for listening to us, and I want to thank all the employees and our customers for trusting in us. And I'm looking forward to continued growth, and I'm there to support the management of OSI. Thank you.

[Operator]

Thank you, ladies and gentlemen, for your participation in today's conference. This does conclude the program. You may now disconnect.