Steven Nielsen
Analyst · KeyBanc
Thanks, Rick. Yesterday, we issued a press release announcing our third quarter results. As you review this release, please note that we have included adjusted EBITDA and churned organic revenue amounts, both non-GAAP financial measures to our release and comments. In addition, during the third quarter of fiscal 2011, we recorded a $2.6 million pretax loss on debt extinguishment and incurred a $0.6 million pretax charge related to a wage and hour class action litigation settlement. See Slides 11 through 14 for a reconciliation of the non-GAAP measures to the GAAP measures in the slide presentation provided for this call. For clarity and to enable comparability between periods, our comments will exclude the effect of these items.
Moving to Slide 3. Revenue for the quarter increased year-over-year to $296.1 million, a growth rate of 17.3%. Please note that all revenue during the quarter was generated by businesses that we own, both in this quarter and the year-ago quarter. Accordingly, all growth this quarter was organic.
Volume during the quarter were strong from telephone companies as a whole, with most companies growing meaningfully while still carefully managing routine capital and maintenance expenditures. And spending by cable customers also increased year-over-year.
Gross margins increased by 28 basis points year-over-year, reflecting improved operating performance. General and administrative expenses declined by 28 basis points year-over-year, reflecting improved operating leverage and tight cost controls. All of these factors produced adjusted EBITDA of $29.9 million for the third quarter, an increase of 25.8% from last year.
Net income of $0.28 per share for the third quarter improved significantly from last year's earnings per share of $0.10. And liquidity was robust in the quarter, with cash and availability under our credit facility at the end of the quarter totaling $252 million after repurchasing 495,500 shares of common stock.
Going to Slide 4. During the quarter, we experienced the effects of a robust and improving industry environment. Revenue from AT&T was $39.8 million or 13.4% of revenue. AT&T was our largest customer. CenturyLink was our second largest customer at 13% of total revenue or $38.5 million. CenturyLink grew over 38% year-over-year. Revenue from Comcast was $37.1 million or 12.5% of revenue. Comcast was our third largest customer and grew 7.2% year-over-year. Verizon was Dycom's fourth largest customer for the quarter at 11% of revenue or $32.7 million. Revenue from Windstream was $26.6 million or 9% of revenue. Windstream was our fifth largest customer. Both Verizon and Windstream grew 49% year-over-year.
Altogether, our revenue grew 17.3%, representing our fifth consecutive quarter of organic growth. Our top 5 customers combined represented 59% of revenue, growing 12.3%, while all other customers increased 25.4%.
Now moving to Slide 5. Backlog at the end of the third quarter was $1.744 billion versus $1.819 billion at the end of the second quarter, a decrease of approximately $75 million. Of this backlog, approximately $961 million is expected to be completed in the next 12 months. Both backlog calculations increased dramatically year-over-year, reflecting an extremely productive period during which we continued to book new work and renew existing work.
With Comcast, we renewed a cable installation services agreement covering New Jersey, Pennsylvania and Texas for 4 years. From Windstream, we secured a new 2-year construction and maintenance agreement in Georgia. With Time Warner Cable, we renewed a 2-year construction and maintenance services agreement in California. From Verizon, a 3-year engineering services agreement covering Florida, Virginia and Texas. And finally, we secured a number of rural broadband projects in the states of Georgia, North Carolina, Tennessee and Vermont.
Headcount remained steady during the quarter at 8,207.
Now I will turn the call over to Drew for his financial review.