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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jan. 27, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Jan. 28, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Apr. 23, 2016 | Jan. 23, 2016 | Oct. 24, 2015 | Jan. 27, 2018 | Jan. 28, 2017 | Jul. 29, 2017 | Jul. 30, 2016 | Jul. 25, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract revenues | $ 655,133 | $ 756,215 | $ 780,188 | $ 786,338 | $ 701,131 | $ 799,223 | $ 789,159 | $ 664,645 | $ 559,470 | $ 659,268 | $ 1,411,348 | $ 1,500,355 | $ 3,066,880 | $ 2,672,542 | $ 2,022,312
Costs of earned revenues, excluding depreciation and amortization | 540,633 | 600,847 | 606,898 | 621,475 | 561,371 | 614,990 | 605,909 | 520,408 | 450,284 | 506,978 | 1,141,480 | 1,176,361 | 2,404,734 | 2,083,579 | 1,593,250
Gross profit | 114,500 | 155,368 | 173,290 | 164,863 | 139,760 | 184,233 | 183,250 | 144,237 | 109,186 | 152,290 |  |  |  |  |
Net income | $ 40,059 | $ 28,776 | $ 43,708 | $ 38,796 | $ 23,663 | $ 51,050 | $ 49,360 | $ 33,083 | $ 15,473 | $ 30,824 | $ 68,835 | $ 74,713 | $ 157,217 | $ 128,740 | $ 84,324
Basic earnings per common share (in dollars per share) | $ 1.29 | $ 0.93 | $ 1.41 | $ 1.24 | $ 0.75 | $ 1.62 | $ 1.57 | $ 1.02 | $ 0.47 | $ 0.94 | $ 2.22 | $ 2.37 | $ 5.01 | $ 3.98 | $ 2.48
Diluted earnings per common share (in dollars per share) | $ 1.24 | $ 0.90 | $ 1.38 | $ 1.22 | $ 0.74 | $ 1.59 | $ 1.54 | $ 1.00 | $ 0.46 | $ 0.91 | $ 2.15 | $ 2.32 | $ 4.92 | $ 3.89 | $ 2.41

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