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Disclosures About Defined Pension Benefit Obligations (Schedule of Pension Plans' Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2016
Dec. 26, 2014
Component:    
Service cost $ 8,676 $ 8,576
Interest cost 15,702 16,658
Expected return on plan assets (19,507) (21,049)
Amortization of previously unrecognized items 5,733 5,410
Settlement (gain) loss (163) 59
Net periodic benefit cost $ 10,441 $ 9,654