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Income Taxes - Reconciliation Between Federal Statutory Income Tax Rate and Effective Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Disclosure [Abstract] |  |  |
Income tax provision at U.S. federal statutory rate | $ 52,963 | $ 50,599 | $ 38,233
State income taxes, net of U.S. federal benefit | 2,193 | 2,244 | 1,719
Foreign tax rate differential | (1,761) | (4,661) | (5,279)
Intercompany interest | (477) | (1,223) | (1,260)
Research credits | (2,572) | (4,398) | (2,104)
Domestic production deduction | (3,075) | (3,726) | (1,607)
Effective Income Tax Rate Recon, AmendedReturns/AuditSettlements/StatueExpiration, Amount | (1,296) |  |
Amended Returns/Audit Settlements/Statute Expirations |  | (248) | (5,806)
Foreign | 744 | (1,702) | (3,109)
Valuation allowance | 2,512 | 1,262 | 1,805
Foreign tax credit | (1,342) | (3,286) | (1,296)
Excess tax benefits relating to stock-based compensation | (24,746) | 0 | 0
Other | (75) | 260 | 1,440
Total provision | $ 23,068 | $ 35,121 | $ 22,736

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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 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: 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 + Details
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