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Income Taxes - Reconciliation Between Federal Statutory Income Tax Rate and Effective Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	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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