Richard McPhail
Executive VP & CFO at Home Depot
Thank you, Billy, and good morning, everyone. In the second quarter, Total sales were $43.2 billion, an increase of approximately 0.6% from last year. Total sales include $1.3 billion from the recent acquisition of SRS, which represents approximately six weeks of sales in the quarter.
During the second quarter, our total Company comps were negative 3.3%, with comps of negative 3.7% in May, negative 0.9% in June, and negative 4.9% in July. Comps in the U.S. were negative 3.6% for the quarter, with comps of negative 4.1% in May, negative 1.4% in June, and negative 5% in July. In the second quarter, our gross margin was approximately 33.4%, an increase of 40 basis points from the second quarter last year, primarily driven by benefits from lower transportation costs and shrink, partially offset by mix as a result of the SRS acquisition.
During the second quarter, operating expense as a percent of sales increased approximately 65 basis points to 18.3% compared to the second quarter of 2023. Our operating expense performance was in line with our expectations. Beginning this quarter, in addition to our GAAP measures, we are providing the following non-GAAP measures: adjusted operating income, adjusted operating margin, and adjusted diluted earnings per share, which excludes noncash amortization of acquired intangible assets. We believe these supplemental measures will help investors better understand and analyze our performance.
Our operating margin for the second quarter was 15.1% compared to 15.4% in the second quarter of 2023. In the quarter, pretax intangible asset amortization was $90 million, including $39 million related to SRS. Excluding the intangible asset amortization in the quarter, our adjusted operating margin for the second quarter was 15.3% and compared to 15.5% in the second quarter of 2023.
Interest and other expense for the second quarter increased by $61 million to $489 million due primarily to higher debt balances than a year ago. In the second quarter, our effective tax rate was 24.5%, compared to 24.4% in the second quarter of fiscal 2023. Our diluted earnings per share for the second quarter were $4.60, a decrease of approximately 1% compared to the second quarter of 2023. Excluding intangible asset amortization, our adjusted diluted earnings per share for the second quarter were $4.67, essentially flat compared to the second quarter of 2023.
During the second quarter, we opened three new stores, bringing our total store count to 2,340. Retail selling square footage was approximately 243 million square feet. At the end of the quarter, merchandise inventories were $23.1 billion, down approximately $200 million compared to the second quarter of 2023, and inventory turns were 4.9 times, up from 4.4 times last year.
Turning to capital allocation. During the second quarter, we invested approximately $720 million back into our business in the form of capital expenditures. And during the quarter, we paid approximately $2.2 billion in dividends to our shareholders. Our disciplined approach to capital allocation remains unchanged. First and foremost, we will invest in the business and expect capital expenditures of approximately 2% of sales on an annual basis. After investing in the business, we plan to pay the dividend and it is our intent to return any excess cash to shareholders in the form of share repurchases. Computed on the average of beginning and ending long-term debt and equity for the trailing 12 months, return on invested capital was approximately 31.9%, down from 41.5% in the second quarter of fiscal 2023.
Now I will comment on our updated outlook for fiscal 2024. As you heard from Ted, given the softer-than-expected performance in the first half of the year, and reflecting continued uncertainty around underlying consumer demand, we believe a more cautious outlook for the year is warranted. With the recent closing of the SRS acquisition, we are now including their results in our consolidated outlook for the year.
For the period matching our first half, which includes periods prior to the acquisition and not fully reflected in our financial statements, SRS generated high single-digit percentage sales growth with operating income growing largely in line with sales. We believe that over the next several years, SRS on its own, and through our combined Pro efforts, will help accelerate sales and earnings growth for our Company.
Updating our fiscal 2024 guidance for the factors we just discussed. We now expect total sales growth between 2.5% and 3.5%, including the SRS acquisition and the 53rd week. The 53rd week is projected to add approximately $2.3 billion to total sales. SRS is expected to contribute approximately $6.4 billion in incremental sales.
Comparable sales are expected to decline between negative 3% and negative 4% for the 52-week period. The high end of our range implies a consumer demand environment consistent with the first half of fiscal 2024. While comparable sales for the Company are not currently on the trajectory for the low end of the range, a negative 4% comp implies incremental pressure on consumer demand beyond what we are seeing today.
We expect to open approximately 12 new stores. Our gross margin is expected to be approximately 33.5%. We expect operating margin to be between 13.5% and 13.6%, and adjusted operating margin to be between 13.8% and 13.9%. Our effective tax rate is targeted at approximately 24%. We expect net interest expense of approximately $2.2 billion.
Our diluted earnings per share percent will decline between negative 2% and negative 4% compared to fiscal 2023, with the extra week contributing approximately $0.30. We expect our adjusted diluted earnings per share percent to decline between negative 1% and negative 3%, compared to fiscal 2023, with the extra week contributing approximately $0.30.
We believe that we have positioned ourselves to meet the needs of our customers in any environment. The investments we've made in our business have enabled agility in our operating model. As we look forward, we will continue to invest to strengthen our position with our customers, leverage our scale and low-cost position to drive growth faster than the market, and deliver shareholder value.
Thank you for your participation in today's call. And Christine, we are now ready for questions.