Computation of Provision (Benefit) for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Current:
Current Federal	$ 15,352	$ 31,954	$ 15,543
Current Foreign	393	(19)	24
Current State	69	124	369
Total current income tax expenses (benefits)	15,814	32,059	15,936
Deferred:
Deferred Federal	41	43	413
Deferred Foreign	777	(566)	395
Total Deferred Income Tax Expense (benefits)	818	(523)	808
Income tax expense	$ 16,632	$ 31,536	$ 16,744