Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Computation of provision (benefit) for income taxes
Current Federal	$ 15,543	$ 15,281	$ 8,131
Current Foreign	24	66	(109)
Current State	369	279	214
Total current income tax expenses (benefits)	15,936	15,626	8,236
Deferred Federal	413	(1,228)	(1,394)
Deferred Foreign	395	510	(22)
Total Deferred Income Tax Expense (benefits)	808	(718)	(1,416)
Income tax expense	$ 16,744	$ 14,908	$ 6,820