Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income tax provisions associated with income from continuing operations	$ 1,122,000	$ 1,758,000	$ 3,916,000	$ 4,215,000
Effective tax rates	26.10%	35.60%	26.50%	36.70%
Permanent tax and discrete tax benefits	200,000		800,000
U.S. federal statutory tax rate	35.00%	35.00%	35.00%	35.00%
Income tax expense from discontinued operations	200,000	100,000	500,000	1,100,000
Income tax benefit from the sale of discontinued operations				700,000
Income tax expense from the sale of discontinued operations		25,000		(676,000)
Effective tax rate applied to discontinued operations	134.60%	96.50%	44.80%	65.00%
Unrecognized tax benefits including interest and penalties	1,400,000		1,400,000		1,400,000
Liability for unrecognized tax benefits to change significantly in the next 12 months	$ 0		$ 0