J. Schlotman
Analyst · Guggenheim Securities
Thanks, Mike, and good morning, everyone. We exceeded our expectations for the quarter, thanks to our associates performing to deliver growth. We continue to implement our long-term growth strategy, which includes targeting capital to grow our business in new and existing markets, leveraging customer insights to solve varied customer needs through both traditional and digital channels and continuing to deliver shareholder value through our share buyback program and dividend.
When we outlined our accelerated growth strategy at our October 2012 investor conference, we also identified the key performance targets for shareholders to measure our progress. I'd like to spend a few minutes discussing the results in each metric. Our first metric is identical supermarket sales without fuel. We are pleased with our first quarter ID sales growth of 4.6%. This strong performance was supported by ID sales growth in every department and every supermarket division. We continue to see outstanding double-digit identical sales growth in our natural foods department. Our produce and general merchandise departments also posted strong ID sales growth, and Kroger's pharmacy department continued its strong performance.
Rolling 4 quarters FIFO operating margin on a 52-week basis, excluding fuel and the pension agreements, increased by 12 basis points. This exceeded our commitment to grow the rate slightly over time on a rolling 4 quarters basis. Until we have Harris Teeter in both the current and base years, the expected increase will be higher than our long-term guidance, which is slightly expanding. Over time, we expect our FIFO operating margin growth, excluding fuel, to return to slightly expanding on a rolling 4 quarters basis.
The third metric is return on invested capital. We reported a return on invested capital on a 52-week rolling 4 quarters basis of 13.5%, which is consistent with ROIC during the same period last year. As we increase capital investments, it will be more difficult to grow ROIC in the near term. However, as these investments mature, we expect them to be accretive to ROIC. As Mike and Rodney already said, our integration with Harris Teeter is well underway, and we're achieving synergies in multiple fronts. One great example is combining insurance programs, which has reduced our annual premiums by $6 million already.
Now I'll share our first quarter 2014 results in more detail. Please note that this is the first period that includes Harris Teeter in Kroger's statement of operations. Year-over-year percentage comparisons are affected as a result. In the first quarter, our net earnings totaled $501 million or $0.98 per diluted share. This includes charges related to the restructuring of certain pension obligations to help stabilize associates' future benefits, as described in yesterday's press release. Excluding the effect of these charges, Kroger's adjusted net earnings were $557 million or $1.09 per diluted share for the first quarter. Net earnings in the same period last year were $481 million or $0.92 per diluted share.
As Mike Ellis said, we are seeing higher inflation than anticipated. We recorded a $28 million LIFO charge during the quarter compared to a $17 million LIFO charge in the same quarter last year. We are increasing our LIFO estimate for the year to $90 million. Our previous LIFO guidance for the fiscal year was a charge of $55 million. This affects the year by about $0.04. FIFO gross margin increased 1 basis point from the same period last year, excluding retail fuel operations. Strong identical sales and cost controls allowed Kroger to leverage operating expenses as a rate of sales in the first quarter. Operating, general and administrative costs plus rent and depreciation, excluding retail fuel operations and pension agreements, declined 9 basis points as a percent of sales compared to the prior year's first quarter.
Now for retail fuel operations. About half of our supermarkets have fuel centers today. In the first quarter, our cents per gallon fuel margin was approximately $0.131 compared to $0.116 in the same quarter last year. Our long-term financial strategy continues to be to maintain our current investment-grade rating, repurchase shares, have an increasing dividend and fund increasing capital investments. Kroger remains committed to achieving a 2 to 2.2 net total debt to EBITDA ratio by mid to late 2015.
Kroger took on debt to finance the Harris Teeter merger and realized no incremental EBITDA in fiscal 2013 because the transaction closed late in the fiscal year. This has a material effect on the company's net total debt to EBITDA -- adjusted EBITDA ratio, which is 2.42x compared to 1.85x during the same period last year. As we get a full year of Harris Teeter EBITDA in the calculation, we expect to be closer to 2.2x by the end of the year. Kroger's net total debt is $11.3 billion, an increase of $3.4 billion from a year ago. This is a result of the debt related to the Harris Teeter transaction and Kroger's share repurchase activity.
Kroger's strong financial position has allowed the company to return more than $1.9 billion to shareholders through buybacks and dividends over the last 4 quarters. During the first quarter, Kroger repurchased 25.7 million common shares for a total investment of $1.1 billion. Capital investments, excluding mergers, acquisitions and purchases of leased facilities, totaled $709 million for the first quarter compared to $600 million -- $640 million for the same period last year. We continue to expect capital investments to be in the $2.8 billion to $3.0 billion range, including Harris Teeter, for fiscal 2014.
Now I'd like to update our growth objectives for fiscal 2014. Based on our strong first quarter results, we raised and narrowed our adjusted net earnings guidance to a range of $3.19 to $3.27 per diluted share for fiscal 2014. The original guidance was $3.14 to $3.25 per diluted share. The company's long-term net earnings per diluted share growth remains -- our guidance remains at 8% to 11%. Shareholder return will be further enhanced by a dividend expected to increase over time. We raised our identical supermarket sales growth guidance, excluding fuel, to 3% to 4% for fiscal 2014, including Harris Teeter. The original guidance was 2.5% to 3.5%.
And now I'll turn it back to Rodney.