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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Income Tax Disclosure [Abstract]      
Balance, beginning of year $ 179,140 $ 38,580 $ 44,167
Acquisitions   137,912 0
Divestitures (31,004)    
Additions based on tax positions related to the current year 7,455 9,780 5,900
Additions for tax positions of prior years 1,994 5,561 237
Reductions for tax positions of prior years (49,849) (8,962) (4,524)
Settlement (3,381) (3,731) (7,200)
Balance, end of year $ 104,355 $ 179,140 $ 38,580