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Defined Benefit Pension and Other Postretirement Plans (Details Textual) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Defined Benefit Pension and Other Postretirement Plans (Textual) [Abstract]    
Net cost to sponsor unfunded and non-qualified supplemental executive retirement plans $ 2.1 $ 2.2
Pension Benefits [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Contribution made to Pension Plan 25.4 16.7
Expected contribution to pensions plans in next twelve months $ 24