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Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 26, 2014	Apr. 26, 2014	Jan. 25, 2014	Oct. 26, 2013	Jul. 27, 2013	Apr. 27, 2013	Jan. 26, 2013	Oct. 27, 2012	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012
Quarterly Financial Data [Abstract]
Revenues	$ 482,071	$ 426,284	$ 390,518	$ 512,720	$ 478,632	$ 437,367	$ 369,326	$ 323,286	$ 1,811,593	$ 1,608,612	$ 1,201,119
Costs of earned revenues, excluding depreciation and amortization	387,221	350,352	327,353	410,119	384,169	357,664	301,516	257,066	1,475,045	1,300,416	968,949
Gross profit	94,850	75,932	63,165	102,601	94,463	79,703	67,810	66,220
Net income	$ 16,489	$ 7,895	$ (3,067)	$ 18,660	$ 14,666	$ 7,199	$ 1,463	$ 11,861	$ 39,978	$ 35,188	$ 39,378
Earnings per common share - Basic	$ 0.49	$ 0.23	$ (0.09)	$ 0.56	$ 0.44	$ 0.22	$ 0.04	$ 0.36	$ 1.18	$ 1.07	$ 1.17
Earnings per common share - Diluted	$ 0.47	$ 0.23	$ (0.09)	$ 0.54	$ 0.43	$ 0.21	$ 0.04	$ 0.35	$ 1.15	$ 1.04	$ 1.14

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