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Defined Pension Benefit Obligations (Schedule of Pension Plans' Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Jun. 30, 2017
Jul. 01, 2016
Component:        
Service cost $ 2,349 $ 5,081 $ 6,749 $ 22,261
Interest cost 9,357 14,568 26,786 45,477
Expected return on plan assets (16,722) (19,723) (47,837) (58,156)
Amortization of previously unrecognized items 3,770 3,249 10,858 14,323
Settlement loss (gain) 51 (150) 135 (244)
Net periodic benefit (income) cost $ (1,195) $ 3,025 $ (3,309) $ 23,661