Income Taxes Income Taxes (Textual) (Details) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Tax Contingency [Line Items]
Income Taxes Paid	$ 5,030,000	$ 8,451,000	$ 1,508,000
Proceeds from Income Tax Refunds	1,115,000	282,000	665,000
Unrecognized tax benefits that would impact effective tax rate	1,800,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	400,000	200,000	100,000
Unrecognized tax benefits, income tax penalties and interest accrued	700,000	400,000
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	$ 200,000
Minimum
Income Tax Contingency [Line Items]
Number of years open for tax examinations	3 years
Maximum
Income Tax Contingency [Line Items]
Number of years open for tax examinations	5 years