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Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jul. 30, 2016
Apr. 23, 2016
Jan. 23, 2016
Oct. 24, 2015
Jul. 25, 2015
Apr. 25, 2015
Jan. 24, 2015
Oct. 25, 2014
Jul. 30, 2016
Jul. 25, 2015
Jul. 26, 2014
Interim Period, Costs Not Allocable [Line Items]                      
Loss on debt extinguishment                 $ (16,260) $ 0 $ 0
Amortization of debt discount                 14,709 0 0
Revenues $ 789,159 $ 664,645 $ 559,470 $ 659,268 $ 578,479 $ 492,363 $ 441,081 $ 510,389      
Costs of earned revenues, excluding depreciation and amortization 605,909 520,408 450,284 506,978 446,114 388,239 355,429 403,468 2,083,579 1,593,250 1,475,045
Gross Profit 183,250 144,237 109,186 152,290 132,365 104,124 85,652 106,921      
Net income $ 49,360 $ 33,083 $ 15,473 $ 30,824 $ 33,827 $ 20,258 $ 9,432 $ 20,807 $ 128,740 $ 84,324 $ 39,978
Basic earnings per common share (in dollars per share) $ 1.57 $ 1.02 $ 0.47 $ 0.94 $ 1.00 $ 0.59 $ 0.28 $ 0.61 $ 3.98 $ 2.48 $ 1.18
Earnings per common share (in dollars per share) $ 1.54 $ 1.00 $ 0.46 $ 0.91 $ 0.97 $ 0.58 $ 0.27 $ 0.59 $ 3.89 $ 2.41 $ 1.15
Seven Point One Two Five Percent Senior Subordinated Notes Due 2021 [Member]                      
Interim Period, Costs Not Allocable [Line Items]                      
Loss on debt extinguishment       $ 16,300