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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, 2016
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]      
Income tax provision at U.S. federal statutory rate $ 50,599 $ 38,233 $ 46,595
State income taxes, net of U.S. federal benefit 2,244 1,719 2,832
Foreign tax rate differential (4,661) (5,279) (4,592)
Intercompany interest (1,223) (1,260) (1,246)
Research credits (4,398) (2,104) (302)
Domestic production deduction (3,726) (1,607) (3,141)
Federal and state audit settlements (248) (5,806) (5,886)
Foreign (1,702) (3,109) (1,654)
Valuation allowance 1,262 1,805 3,888
Foreign Tax Credit (3,286) (1,296) 150
Other 260 1,440 1,608
Total provision $ 35,121 $ 22,736 $ 38,252