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Schedule of Differences between Income Taxes at Federal Statutory Rate and Actual Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2012
Reconciliation of Statutory Federal Tax Rate [Line Items] |  |  |
Provision at federal statutory rate | $ 88,487 | $ 77,691 | $ 57,886
State and local income taxes, net of federal benefit | 3,748 | 2,815 | 846
Federal income tax credits and incentives | (772) | (2,468) | (831)
Domestic production activities deduction | (7,947) | (7,303) | (5,145)
Change in uncertain tax positions | (6,631) | (718) | 1,879
Executive compensation limitation |  |  | 38
Change in current tax payable and deferred tax liabilities | 125 | 13 | (1,018)
Other permanent items | 293 | 266 | 298
Total income tax expense | $ 77,303 | $ 70,296 | $ 53,953

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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