Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income tax provisions associated with income from continuing operations	$ 1,466,000	$ 1,877,000
Effective tax rates	28.80%	30.60%
U.S. federal statutory tax rate	35.00%	35.00%
Unrecognized tax benefits including interest and penalties	900,000		1,000,000
Liability for unrecognized tax benefits to change significantly in the next 12 months	$ 0