Financial Results in Discontinued Operations (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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 0	$ 3,936	$ 2,727	$ 7,720
Income before income tax provision	0	468	180	985
Provision for income taxes on operations	0	196	48	360
Income from operations, net of tax	0	272	132	625
Gain (loss) on sale of discontinued operations, net of tax	(34)	0	2,328	0
Income (loss) from discontinued operations, net of tax	$ (34)	$ 272	$ 2,460	$ 625