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Schedule of Differences between Income Taxes at Federal Statutory Rate and Actual Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Income Tax Disclosure [Abstract]      
Provision at federal statutory rate $ 170,095 $ 194,735 $ 134,160
State and local income taxes, net of federal benefit 14,255 11,021 6,599
Federal income tax credits and incentives (3,518) (3,228) (4,194)
Domestic production activities deduction (16,175) (19,527) (12,609)
Change in uncertain tax positions 396 375 611
Effect of U.S. federal tax reform 38,620    
Other (795) (1,244) 724
Total income tax expense $ 202,878 $ 182,132 $ 125,291