Deferred Tax Asset Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Taxes [Line Items]
Balance, Beginning of Year		$ 10,486	$ 66
Deferred tax asset valuation allowance		(10,420)	10,420
Balance, End of the Year		66	10,486
Income Tax Expense Benefit
Income Taxes [Line Items]
Deferred tax asset valuation allowance	(66)	(10,420)	7,628
Other Comprehensive Income (Loss)
Income Taxes [Line Items]
Deferred tax asset valuation allowance			$ 2,792