Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Line Items]
Income tax expense	$ 9,090,000	$ 5,403,000	$ 439,000
Gross U.S. federal income tax NOL carry forward	25,750,000
NOL expiration year for U.S. Federal	2031
Net federal NOL carry forward	9,012,000	12,776,000
State tax net operating loss (NOL) carry forward	802,000	691,000
Valuation allowance	1,265,000	0
NOL Expiration Year For State	2015
Expiration of statutes of limitations		161,000
Unrecognized tax benefits	0
Reduction in accrued interest and penalties	0	(98,000)	(11,000)
CANADA
Income Tax Disclosure [Line Items]
Valuation allowance	$ 987,000
NOL Expiration Year For Foreign	2032