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Subsequent Events	12 Months Ended
Subsequent Events	Jul. 25, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On August 7, 2015, the Company acquired TelCom Construction, Inc. and an affiliate (collectively, "TelCom"), for approximately $48.6 million in cash. TelCom, based in Clearwater, Minnesota, provides construction and maintenance services for telecommunications providers throughout the United States. During August 2015, the Company repurchased 149,224 shares of its common stock in open market transactions, at an average price of $67.01 per share, for approximately $10.0 million under its share repurchase program authorized on July 1, 2015. On August 25, 2015, the Company announced that its Board of Directors authorized an additional $50.0 million to repurchase shares of the Company's outstanding common stock through February 2017 in open market or private transactions. As of September 4, 2015, $50.0 million remained available for repurchases.