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Disclosures About Defined Pension Benefit Obligations (Schedule of Pension Plans' Net Benefit Obligation) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 30, 2011
Dec. 31, 2010
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]    
Service cost $ 8,846 $ 7,249
Interest cost 18,674 14,686
Expected return on plan assets (18,600) (14,255)
Amortization of previously unrecognized items 4,867 4,051
Net periodic benefit cost $ 13,787 $ 11,731