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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jul. 25, 2015
Apr. 25, 2015
Jan. 24, 2015
Oct. 25, 2014
Jul. 26, 2014
Apr. 26, 2014
Jan. 25, 2014
Oct. 26, 2013
Jul. 25, 2015
Jul. 26, 2014
Jul. 27, 2013
Quarterly Financial Data [Abstract]                      
Revenues $ 578,479 $ 492,363 $ 441,081 $ 510,389 $ 482,071 $ 426,284 $ 390,518 $ 512,720 $ 2,022,312 $ 1,811,593 $ 1,608,612
Costs of earned revenues, excluding depreciation and amortization 446,114 388,239 355,429 403,468 387,221 350,352 327,353 410,119 1,593,250 1,475,045 1,300,416
Gross profit 132,365 104,124 85,652 106,921 94,850 75,932 63,165 102,601      
Net income $ 33,827 $ 20,258 $ 9,432 $ 20,807 $ 16,489 $ 7,895 $ (3,067) $ 18,660 $ 84,324 $ 39,978 $ 35,188
Earnings per common share - Basic $ 1.00 $ 0.59 $ 0.28 $ 0.61 $ 0.49 $ 0.23 $ (0.09) $ 0.56 $ 2.48 $ 1.18 $ 1.07
Earnings per common share - Diluted $ 0.97 $ 0.58 $ 0.27 $ 0.59 $ 0.47 $ 0.23 $ (0.09) $ 0.54 $ 2.41 $ 1.15 $ 1.04