Income Taxes (Details) (USD $)	3 Months Ended			6 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Effective income tax rate				18.00%	37.20%
Discrete income tax (benefit)	$ (400,000)	$ (100,000)	$ 100,000
Percentage points that reduced effective tax rate				(19.1)	(2.7)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance		2,720,000		2,720,000
Increases related to prior year income tax positions				202,000
Decreases related to expiration of statute of limitations				(98,000)
Unrecognized tax benefits, ending balance	2,824,000			2,824,000
Unrecognized tax benefits that would impact effective tax rate	2,800,000			2,800,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	200,000			200,000
Income tax penalties and interest accrued	500,000			500,000		600,000
Accumulated undistributed foreign earnings	23,400,000			23,400,000
Minimum [Member]
Income Tax Contingency [Line Items]
Estimated unrecognized deferred tax liability	2,500,000			2,500,000
Maximum [Member]
Income Tax Contingency [Line Items]
Estimated unrecognized deferred tax liability	$ 3,500,000			$ 3,500,000