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Basis Of Presentation And Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Jun. 30, 2012
M
Oct. 01, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Liquid investments, maximum maturity period, months 3  
Fair value of long-term debt $ 259.0 $ 274.3
Carrying value of long-term debt $ 261.3 $ 272.5