Earlier this morning, we released our fiscal 2027 first quarter results, along with certain outlook information. Total revenues of $1.965 billion exceeded the high end of our expectation, increasing 56% compared to Q1 FY 2026, including organic growth of 25%. With robust and intensifying demand drivers, we remain disciplined in our awards, high-grading the pipeline and intensely focusing on execution. The results of this discipline are reflected in our earnings for the quarter, which also exceeded the high end of our expectations.
adjusted EBITDA of $262.5 million and adjusted EBITDA margin of 13.4% increased 75% and 141 basis points, respectively. Non-GAAP adjusted diluted EPS was $4.42, an 85% increase compared to Q1 fiscal 2026. We ended the quarter with record total backlog of $11.9 billion, growing 25% sequentially and representing a book-to-bill of 2.2x for the quarter. Notably, award this quarter continued to diversify our backlog across customers, demand drivers, and geographies.
These awards provide certainty and visibility that allow Dycom to plan and invest for work far in the future and positions us for multi-year growth. With strong results in Q1 and intensifying demand across our business, we are increasing our full-year fiscal 2027 outlook to a range of $7.38 billion-$7.65 billion. At the midpoint and excluding the extra week from last year, our new outlook represents total revenue growth of 38%, including 14% organic compared to last year. Our Communications segment generated significant revenue growth of 25% compared to Q1 FY 2026, with adjusted EBITDA margins that increased 31 basis points year-over-year.