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Other Comprehensive Income (Details) (USD $)
In Thousands
3 Months Ended12 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Other Comprehensive Income Details [Abstract]           
Net Income$ 10,030$ 11,390$ 10,332$ 10,828$ 8,798$ 9,137$ 7,671$ 7,834$ 42,580$ 33,440$ 24,905
Other Comprehensive Income           
Foreign Currency Translation        (663)5360
Actuarial Gain (Loss) on Pension Valuation, Net of Deferred Taxes        21(457)0
Total Comprehensive Income        $ 41,938$ 33,519$ 24,905