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Income Taxes - Reconciliation of the Federal Statutory Tax Rate to the Total Tax Provision (Detail)
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]    
Federal income taxes computed at the statutory rate (34.00%) 34.00%
State income taxes, net of federal benefit (3.30%) 3.30%
Research & development tax refunds & credits (5.20%) (5.60%)
Dividend received deduction   (6.10%)
Domestic international sales corporation benefits (5.80%) (4.20%)
Other, net (0.40%) (0.10%)
Effective income tax rate (48.70%) 21.30%