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Accumulated Other Comprehensive Income (Loss) (Changes in AOCI by Component) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Accumulated foreign currency translation at beginning of period     $ (83,166)  
Other comprehensive income (loss) before reclassifications - Foreign currency translation     30,661  
Amounts reclassified from AOCIL - Foreign currency translation     0  
Other comprehensive income (loss) - Foreign currency translation     30,661  
Accumulated foreign currency translation at end of period $ (52,505)   (52,505)  
Accumulated retirement liability at beginning of period     (251,865)  
Other comprehensive income (loss) before reclassifications - Retirement liability     (1,222)  
Amounts reclassified from AOCIL - Retirement liability 5,541 $ 6,002 10,160 $ 12,011
Other comprehensive income (loss) retirement liability 4,682 5,471 8,938 14,043
Accumulated retirement liability at end of period (290,136)   (290,136)  
Accumulated loss on derivatives at beginning of period     (460)  
Other comprehensive income (loss) before reclassification - Derivatives (769) (138) 136 (970)
Amounts reclassified from AOCIL - Derivatives 190 1,384 519 2,790
Other comprehensive income (loss) - Derivatives (579) 1,246 655 1,820
Accumulated loss on derivatives at end of period 327   327  
Accumulated other comprehensive loss at beginning of period     (335,491)  
Other comprehensive income (loss) before reclassifications - Total     29,575  
Amounts reclassified from AOCIL - Total     10,679  
Other comprehensive income (loss), net of tax 24,400 19,412 40,254 (12,951)
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings (47,077) $ 0 (47,077) $ 0
Accumulated other comprehensive loss at end of period $ (342,314)   (342,314)  
Accumulated foreign currency translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings     0  
Accumulated retirement liability        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings     (47,209)  
Accumulated gain (loss) on derivatives        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings     $ 132