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Income Taxes (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 30, 2018
Dec. 29, 2017
Mar. 29, 2019
Mar. 30, 2018
Federal statutory income tax rate     21.00% 24.60%
Repatriation of foreign earnings, amount $ 16.9 $ 240,900,000    
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 0    
Accrued income taxes, current 21,400,000   $ 31,100,000 $ 21,400,000
Accrued Income Taxes, Noncurrent $ 221,100,000   188,600,000 $ 221,100,000
Years One through Four [Member] [Domain]        
taxes payable, repatriation tax     18,000,000  
Year Five [Member] [Domain]        
taxes payable, repatriation tax     33,600,000  
Year Six [Member]        
taxes payable, repatriation tax     44,900,000  
Years One through Five [Member]        
taxes payable, repatriation tax     $ 56,100,000