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Income Tax (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 29, 2013
Mar. 30, 2012
Mar. 29, 2013
Mar. 30, 2012
Income Tax Disclosure [Abstract]        
Effective tax rate 26.70% 27.90% 26.13% 28.37%
Unrecognized tax benefits, gross $ 20.0   $ 20.0  
Unrecognized tax benefits if recognized, would affect our effective tax rate 13.5   13.5  
Licensing revenue withholding tax remittances $ 11.9 $ 10.2 $ 21.3 $ 21.4