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Intangible Assets (Details Textuals) (USD $)
In Millions
3 Months Ended 9 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Component of Company's Intangible Assets (Textuals) [Abstract]        
Amortization expense of intangible assets $ 5.4 $ 4.9 $ 15.1 $ 14.8
Expected aggregate amortization expense of intangible assets for the next five fiscal years:        
Fiscal 2011     5.0  
Fiscal 2012     20.7  
Fiscal 2013     20.1  
Fiscal 2014     19.2  
Fiscal 2015     $ 16.2