Gerald Lyons
Analyst · Raymond James
Thanks, Mike. We produced solid financial results within our forecasted range. Higher than forecast gross margins partially offset the impact from lower sales volume. As a result, we ended up with non-GAAP operating income very close to our forecast midpoint. Our GAAP diluted EPS of $0.49 per share and non-GAAP diluted EPS result of $0.65 per share are summarized on Slide 4.
Net sales for the third quarter increased 2% to $814 million. The dollar impact on sales due to foreign currency translation was a positive $7 million. 4% net sales growth for our Worldwide Barcode, Networking & Security segment more than offset lower net sales for Worldwide Communications & Services segment. Worldwide Communications & Services segment net sales included $9 million of net sales resulting from the Intelisys acquisition.
Our third quarter 2017 gross profit margin was 11.4% higher than prior periods and higher than our expected margin. The margin includes higher vendor incentive program recognition for our Worldwide Communication & Services segment, which we would not expect to continue. On Slides 5 and 6, you can see our current quarter, sequential quarter and prior year quarter margins by segment.
SG&A expenses, excluding amortization of intangible assets and acquisition costs, increased $7.4 million from the prior year quarter to $67 million for the third quarter 2017. This increase reflects the addition of Intelisys, which was not in the prior year quarter, and to a lesser extent, higher bad debt expense.
Our third quarter 2017 non-GAAP operating income was $26.2 million or 3.2% of net sales compared to $25.3 million or 3.2% in the prior year quarter. This represents a 3% year-over-year increase in non-GAAP operating income. We have a $113 million contingent consideration on our March 37 -- March 31, 2017, balance sheet, reflecting the present value of expected future earn-out payments for our acquisitions of Intelisys, which occurred in September 2016; and Network1, which occurred in January 2015.
For the third quarter 2017, we recorded a loss for the increase in fair value of contingent consideration of $2 million. Our fourth quarter 2017 forecast, we estimate the change in fair value of contingent consideration to be a loss of $3.9 million.
Our effective tax rate was 36.5% for the third quarter 2017 and 34.2% for the prior year period, in part from the mix of higher income in the United States. For the fiscal year 2017 forecast, we are using a 35.5% effective tax rate. Third quarter 2017 GAAP diluted EPS totaled $0.49, which decreased year-over-year from higher intangible amortization expense and the change in fair value of contingent consideration from the Intelisys acquisition. Non-GAAP diluted EPS of $0.65 increased 2% year-over-year. Average diluted shares for the third quarter totaled 25.4 million, down 2% from the year earlier period as a result of the share repurchases.
Now shifting to the balance sheet and to the capital allocation plan. Our working capital balance sheet and cash flow measures are referenced on Slides 7 and 8 in our presentation. One of the highlights from Slide 8 is the $112 million of operating cash flow generated over the last 12 months, which is significantly higher than the prior year period. This reflects some working capital efficiency and the additional cash flow from our Intelisys acquisition. We had inventory turns of 5.6x and decreased inventory levels by 10% year-over-year. DSO, excluding Intelisys, came in at 60 days, still higher than our desired range and primarily reflects the aging of customer-specific accounts in North America and in Brazil.
During the quarter, we experienced slower collections for our communications business in Latin America, including Brazil. Our balance sheet remains very strong and continues to provide us with the ability to execute our capital plan -- capital allocation plan, which includes, in order: organic growth, strategic acquisitions and share repurchases.
At March 31, 2017, we had cash and cash equivalents of $62 million and debt of $114 million or net debt of $52 million. Our leverage totaled approximately 0.46x trailing 12-month adjusted EBITDA. And ROIC was 12.6% for the third quarter 2017.
On April 3, 2017, we amended and extended our $300 million revolving credit facility for 5 years to mature in April of 2022. With the existing credit facility set to mature in November of 2018, it was an opportunistic time to complete the new facility with a strong banking group, including leading global banks. Our amended credit facility provides us with financial flexibility to meet our working capital needs and to invest in our future growth. During the quarter, we had no share repurchases and ended the quarter with approximately $100 million remaining on our share repurchase authorization.
Now turning to our forecast on Slide 9. The forecast reflects weakness in our international communications business. We need scale and we also have higher forecasted bad debt expense for this -- for these businesses. Applying these impacts, we expect net sales for the fourth quarter of fiscal year 2017 to range from $860 million to $920 million with GAAP diluted earnings per share to range from $0.44 per share to $0.51 per share and non-GAAP diluted earnings per share to range from $0.64 per share to $0.71 per share. The foreign exchange rates used in our forecast are summarized in our presentation slides. And I'll now turn the call back over to Mike.