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Income Taxes - Reconciliation of the Federal Statutory Tax Rate to the Total Tax Provision (Detail)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
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%	2.50%
Research & development tax refunds & credits	(33.60%)
Dividend received deduction	(3.00%)	(1.60%)
Domestic international sales corporation benefits	(1.80%)
Tax-exempt interest income	(1.40%)	(0.80%)
Other, net	(3.70%)	0.60%
Effective income tax rate	(6.20%)	34.70%

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Effective income tax rate reconciliation domestic international sales corporation benefits.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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