Computation of Provision (Benefit) for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Disclosure - Computation of Provision (Benefit) for Income Taxes (Details) [Line Items]
Current Federal	$ 31,954	$ 15,543	$ 15,281
Current Foreign	(19)	24	66
Current State	124	369	279
Total current income tax expenses (benefits)	32,059	15,936	15,626
Deferred Federal	43	413	(1,228)
Deferred Foreign	(566)	395	510
Total Deferred Income Tax Expense (benefits)	(523)	808	(718)
Income tax expense	$ 31,536	$ 16,744	$ 14,908