Revenues and Expenses Associated with Operations of Ampac-Isp (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Assets Held For Sale [Line Items]
Revenues		$ 15,042		$ 27,839
Operating income (loss) before tax	(78)	(98)	(64)	301
Income tax expense (benefit)	(28)	84	(23)	367
Net loss from discontinued operations	(50)	(182)	(41)	(66)
Adjustment to gain on sale of discontinued operations before tax	32		25
Income tax expense (benefit)	11		9
Net adjustment to gain on sale of discontinued operations	21		16
Loss from discontinued operations, net of tax	$ (29)	$ (182)	$ (25)	$ (66)