Income Taxes (Details) (USD $)	3 Months Ended			9 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2011
Income Tax Disclosure [Abstract]
Effective income tax rate				20.60%	31.80%
Discrete income tax (benefit)			$ 600,000	$ 1,200,000
Tax benefit for additional research and development tax credits	1,100,000
Tax contingencies, state and local		100,000
Percentage points that reduced effective tax rate				(18.6)	(4.8)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance		2,061,000		2,061,000
Increases due to prior year income tax positions				631,000
Decreases related to prior year income tax positions				(67,000)
Decreases related to expiration of statute of limitations				(83,000)
Unrecognized tax benefits, ending balance	2,542,000			2,542,000
Unrecognized tax benefits that would impact effective tax rate	2,500,000			2,500,000
Income tax penalties and interest accrued	600,000			600,000		600,000
Accumulated undistributed foreign earnings	$ 17,300,000			$ 17,300,000