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Income Taxes - Reconciliation of the Federal Statutory Tax Rate to the Total Tax Provision (Detail)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]    
Federal income taxes computed at the statutory rate 34.00% (34.00%)
State income taxes, net of federal benefit 1.50% (3.30%)
Research & development tax refunds & credits (2.80%) (5.20%)
Dividend received deduction (2.20%)  
Domestic production activities deduction (1.90%)  
Domestic international sales corporation benefits   (5.80%)
Other, net (3.40%) (0.40%)
Effective income tax rate 25.20% (48.70%)