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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jul. 29, 2017
Apr. 29, 2017
Jan. 28, 2017
Oct. 29, 2016
Jul. 30, 2016
Apr. 23, 2016
Jan. 23, 2016
Oct. 24, 2015
Jul. 29, 2017
Jul. 30, 2016
Jul. 25, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Contract revenues $ 780,188 $ 786,338 $ 701,131 $ 799,223 $ 789,159 $ 664,645 $ 559,470 $ 659,268 $ 3,066,880 $ 2,672,542 $ 2,022,312
Costs of earned revenues, excluding depreciation and amortization 606,898 621,475 561,371 614,990 605,909 520,408 450,284 506,978 2,404,734 2,083,579 1,593,250
Gross profit 173,290 164,863 139,760 184,233 183,250 144,237 109,186 152,290      
Net income $ 43,708 $ 38,796 $ 23,663 $ 51,050 $ 49,360 $ 33,083 $ 15,473 $ 30,824 $ 157,217 $ 128,740 $ 84,324
Basic earnings per common share (in dollars per share) $ 1.41 $ 1.24 $ 0.75 $ 1.62 $ 1.57 $ 1.02 $ 0.47 $ 0.94 $ 5.01 $ 3.98 $ 2.48
Diluted earnings per common share (in dollars per share) $ 1.38 $ 1.22 $ 0.74 $ 1.59 $ 1.54 $ 1.00 $ 0.46 $ 0.91 $ 4.92 $ 3.89 $ 2.41