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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
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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

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- Definition Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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