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Accumulated Other Comprehensive Income (Loss) (Activity and Classification of Derivative Deferral in AOCI) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Derivative Instruments, Gain (Loss)    
Net actuarial gain (loss) during period $ (44,001) $ 6,544
Tax effect 8,395 (987)
Net deferral in AOCIL of retirement liability (35,606) 5,557
Net deferral in AOCIL of derivatives (effective portion) 114 (870)
Tax effect (73) 40
Net deferral in AOCIL of derivatives 41 (830)
Foreign currency contracts    
Derivative Instruments, Gain (Loss)    
Net deferral in AOCIL of derivatives (effective portion) 639 (2,449)
Interest rate swaps    
Derivative Instruments, Gain (Loss)    
Net deferral in AOCIL of derivatives (effective portion) $ (525) $ 1,579