J. Schlotman
Analyst · Guggenheim Securities
Thanks, Mike, and good morning, everyone. 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're very pleased with our second quarter ID sales growth of 4.8%. This strong performance was supported by ID sales growth in every department in every supermarket division. Our natural foods department continues to grow in the double digits, accelerated by significant household gains. Rolling 4 quarters FIFO operating margin, excluding fuel and adjustment items, expanded by 7 basis points. Over time, we expect our FIFO operating margin growth rate, excluding fuel, to return to slightly expanding on a rolling 4 quarters basis.
The third target metric is return on invested capital. We reported a return on invested capital on a rolling 4 quarters basis, excluding adjustment items of 13.6%, which was an increase from 13.5% in the same period last year. Increased capital investments will make it more difficult to grow ROIC in the near term, however, we expect these investments to be accretive to ROIC as they mature. We expect our year-end ROIC, which will factor in a full year of increased capital investments and fully reflect Harris Teeter in our calculation, to show a slight decline compared to the end of fiscal 2013.
Now I'll share our second quarter 2014 results in more detail. Please note that this quarter includes Harris Teeter and Kroger's statement of operations, so year-over-year percentage comparisons are affected as a result.
In the second quarter, our net earnings totaled $347 million or $0.70 per diluted share. Net earnings in the same period last year were $317 million or $0.60 per diluted share. As Mike said, we are seeing higher inflation than originally anticipated. We recorded a $26 million LIFO charge during the quarter, compared to a $13 million LIFO charge in the same quarter last year. We began fiscal 2014 estimating LIFO for the year at $55 million. At the end of the first quarter, we increased our LIFO guidance to a charge of $90 million. As reported this morning, we are increasing our LIFO estimate for the year to $100 million, which is an incremental $0.01 charge to net earnings per diluted share in the second quarter and $0.05 to $0.06 for the full year.
As we have mentioned in the past, we manage the company without regard to our LIFO charge and many of the items we discussed are on a FIFO basis. So when we develop our expectations for every given year, we estimate LIFO last. The reason for this is LIFO is merely an accounting convention. Typically, a higher LIFO charge would be a headwind to results, but our strong sales helped us overcome the higher-than-expected charge and increase our guidance. FIFO gross margin decreased 12 basis points from the same period last year, excluding retail fuel operations.
Operating, general and administrative costs, plus rent and depreciation, excluding retail fuel operations, were essentially flat as a percent of sales compared to the prior year. Increases in workers' compensation and general liability reserves negatively affected this comparison by 8 basis points.
Now for retail fuel operations. About half of our supermarkets have fuel centers today. In the second quarter, our cents per gallon fuel margin was approximately $0.18 compared to $0.165 in the same quarter last year.
Our long-term financial strategy continues to be: maintain our current investment grade debt rating, repurchase shares, have an increasing dividend and fund increasing capital investments. Achieving the 2x to 2.2x net total debt to adjusted EBITDA ratio by mid to late 2015 remains a key objective. Kroger took on debt to finance the Harris Teeter merger and has not yet final -- realized a full year of Harris Teeter EBITDA. This has caused a significant increase in the company's net total debt to adjusted EBITDA ratio, which is 2.33x as of the close of the second quarter compared to 1.77x during the same period last year. This is, however, an improvement from the 2.42x we reported last quarter.
Kroger's net total debt is $11.2 billion, an increase of $3.5 billion from a year ago. This includes the debt related to the Harris Teeter transaction and the share repurchases activity so far this year. Kroger's strong financial position allow the company to return more than $1.9 billion to shareholders through share buybacks and dividends over the last 4 quarters. During the second quarter, Kroger repurchased 1.6 million common shares for a total investment of $78 million. All $500 million of the buyback authorization in June, granted in June, is still available.
Capital investments, excluding mergers, acquisitions and purchases of leased facilities, totaled $672 million for the second quarter compared to $507 million for the same period last year. We continue to expect capital investments to be in the $2.8 billion to $3 billion range, including Harris Teeter for fiscal 2014.
Now I'd like to update our growth objectives for 2014. Based on our strong second quarter results, we raised and narrowed our adjusted net earnings per diluted share guidance to a range of $3.22 to $3.28 for fiscal 2014. The previous guidance was $3.19 to $3.27 per diluted share. The company's long-term net earnings per diluted share growth guidance remains 8% to 11% and shareholder return will be further enhanced by dividend expected to increase over time.
We raised our identical supermarket sales growth guidance, excluding fuel, to 3.5% to 4.25% for fiscal 2014. The previous guidance was 3% to 4%. We are optimistic, as we look forward to the remainder of the year but, keep in mind, we had a very strong fourth quarter last year to compare to.
Now I'll turn it back to Rodney.