Stuart Haselden
Analyst · Barclays
Thanks, Glenn. Let me reiterate how pleased we are with the performance in Q1. We are successfully executing on our strategies and seeing consistent results across several key parts of the business that are now extending into Q2 and further setting the stage for us to achieve our 2020 goals.
While much work remains to be done, we are finding success in driving traffic and conversion increases at both stores and online across diverse geographies. Importantly, the supply chain and technology infrastructure investments we've made over the last few years offer us a stable platform to grow and scale the business globally. And what I'd like our investors to hear is that the success we are seeing now is not merely the lapping of weak prior year comparisons. What we are seeing is important momentum across the core areas of our business in channel, product and guest engagement. This momentum reflects the structural long-term investments that we've made and continue to make to drive the comp and noncomp revenue increases that are enabling us to deliver on our multiyear plans.
We would further offer that our current results are a validation of these strategies, and we now have even more opportunity to accelerate these investments in the areas that hold the greatest potential. Let me offer a few highlights from Q1 that illustrate what I'm talking about.
First, in channel, we saw our investments in our website and mobile capabilities deliver e-commerce conversion increases of 20%. This was further amplified by traffic increases of 30% that were driven by our improved product assortments and digital marketing efforts. Within our stores, this was the second quarter in a row of positive store traffic, which increased in the mid-single-digit range and drove the overall comp results. And we continue to expand our international footprint with store openings in key markets, including Berlin and Seoul.
Next, within product, we posted double-digit positive comp increases in our core businesses for both men and women. Bras and accessories achieved double-digit comp growth as well while also accelerating meaningfully versus Q4.
And finally, in guest engagement, we saw continued success in our community and digital strategies, which contributed to a 28% increase in guest acquisition in the quarter, fueling traffic gains across both stores and e-commerce. These efforts combine to deliver a strong financial result for the first quarter with total revenue growing 25% to $650 million, our combined comps and dollar comp increasing 19%, with stores rising 6% and e-commerce up 60%, gross margin increasing 270 basis points versus adjusted gross margin last year as we saw both product margin expansion and leverage on our occupancy costs. And we are able to leverage SG&A by 130 basis points. These results contributed to a 16% operating margin and EPS of $0.55 or 72% growth versus the same period last year. Given this continued progress, we are confident in our plans for Q2 and the remainder of the year, which is reflected in our updated guidance.
Looking to the future, we remain firmly on track to achieve our ambition of $4 billion in revenue in 2020. As previously mentioned, the path we're taking to achieve this goal includes product innovation across categories with significant opportunity remaining in men's in particular, expanding the lululemon footprint in both North America and our international markets and continuing to accelerate our digital business.
Let me now offer some color on our progress within each of these growth pillars in Q1 and looking forward. We're excited about our product pipeline as we continue to drive category-defining innovation and solve problems for athletes. Some examples include our recently developed Out of Mind short liner in men's made from a lightweight, breathable mesh. This improved liner construction is now offered in our 3 core short styles: Surge, Pace Breaker and the T.H.E. short, which are all performing extremely well now into Q2.
We launched our City Sweat franchise for men, which includes a collection of hoodies and joggers made from our technical French Terry fabric. Guests responded well to this collection in Q1, and this paves the way for further opportunities in our office travel commute category for men's.
For women, building on the success of Enlite, we see a compelling opportunity in the bra category. We're developing new styles with varying levels of support to broaden our overall assortment. In Q1, we launched the Speed Up Bra featuring a new molded technology, and we have additional styles ready to introduce later this year. We're also excited about our upcoming Embrace Movement collection. This will be a technically driven line of bottoms for women and men offering zone compression, fully leveraging our ongoing work as part of the science of feel. Expect to hear more about this in the fall when we launch the line.
Shifting now to our North American stores. We posted another strong quarter with comps up 6%, driven by an accelerating traffic trend versus Q4. And we're happy to see this trend continuing now into Q2, reflecting our momentum in guest acquisition and in-store conversions.
Our stores remain among the most productive in apparel retail, which is the direct result of the passion of our educators, our innovative product assortments, agile store formats and connection to our communities. In a moment, I'll discuss our digital business in more detail, but first, I want to say that a big part of our recent success has been our omnichannel focus on serving our guests and our ability to leverage this across channels. We continue to expand in this regard, with ship from store now available in nearly 300 locations. And we remain on track to begin the rollout of buy online, pick up in-store during the second half of the year.
Switching now to our business outside of North America where we are still in the early innings of one of our most important growth strategies. Asia continues to lead the way for us, and in Q1, we saw combined comps over 50%, which results in China particularly strong. We successfully opened our third and fourth stores in Seoul, Korea with the most recent opening in the iconic Lotte World Mall. We continue to expect to open 15 to 20 stores in Asia in 2018 and also plan to launch a local e-commerce site in Korea later this year.
In Europe, we saw strong growth as well with double-digit comps exceeding our plans. And in addition to the recent store openings in Berlin and Frankfurt, we added to our presence in the U.K. with a new store in Guildford outside of London.
And finally, I'd like to speak to the exciting progress we're seeing in our digital and e-commerce business. We posted e-commerce comps of 60% on a constant-dollar basis in Q1, driven by strong increases in traffic and conversion. While our comparisons get more difficult in each subsequent quarter in 2018, we are pleased to see strong momentum extending into Q2. Looking at traffic, our digital teams are driving high-quality web and mobile traffic leveraging our e-mail file growth, improving our targeting capabilities and seeing more returned guests.
A few stats I'd like to highlight here. Our e-mail file nearly doubled in the quarter. Direct marketing-related traffic to our site increased by more than 60%. And we saw an increase of over 50% in transactions made by existing guests.
And as we are finding success in driving higher traffic levels, we're also delivering a better online experience for our guests. We've elevated the overall guest experience with better landing pages, enhanced content and improved navigation and merchandising.
We see additional opportunities in this area in the near term. For example, we began streamlining the checkout process in Q1 with further progress planned into Q2 and Q3. And as I said on the last call, we are starting to bring data-driven insights into our core decision-making across the business, but particularly within the digital channel. We're currently developing and rolling out more sophisticated and automated tools, which will allow us to take mobile, search, browse, e-mail and the post-purchase experience to new levels.
So overall, we're pleased with our e-commerce results and see progress building towards our strategic goals for this part of the business.
A key enabler of our growth and continued guest engagement are the brand activations and events we host in our markets around the world. Building on our strong brand momentum, in Q1, we celebrated International Women's Day through events in key cities around the globe, including Washington, D.C., Melbourne and London.
In Q2, to further engage with our run-focused guests, we are sponsoring 10-K races in Toronto and Edmonton, which sold out in less than 24 hours after registration opened.
And earlier this month, I'm excited to announce that we launched our 360-degree run-focused campaign, Let Your Mind Run Free.
And as you know, one of the hallmarks of our company is our investment in people. We have a long-standing commitment to leadership development, and we continue to roll out programs and experiences for all employees that bring to life the unique aspects of the lululemon culture.
Last year, we made a commitment to achieve pay equity for women and men across our organization by the end of 2018. Nearly 80% of our workforce is comprised of women, and we knew this was simply the right thing to do. I'm proud to report that last month, 9 months ahead of schedule, we delivered on this commitment and will maintain this standard moving forward. This puts us in a leadership position among companies across industries.
Now before I share the specific details of our financial performance, it's my pleasure to introduce our new Chief Financial Officer, PJ Guido. Some of you may be familiar with PJ given his 15 years of prior experience leading various finance functions at Fortune 500 retail organizations. I'll ask him to say a few words now. PJ, welcome.