Income Taxes Textual (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Income Tax Disclosure [Abstract]
Investment Income, Interest	$ (209)	$ 219	$ 25
Accrued interest included in unrecognized income tax benefits	56
Unrecognized tax benefits if recognized would impact the reported effective tax rate	33
Tax positions for which the deductibility is highly certain but uncertainty about the timing	1,048
Income Taxes [Line Items]
Unrecognized income tax benefits	1,048	4,898	4,194	634
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	124	1,195
Accrued Interest Included [Member]
Income Taxes [Line Items]
Unrecognized income tax benefits	1,104
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Income Tax Expense (Benefit), Accelerated Depreciation	$ (3,198)	$ (7,926)	$ (2,552)