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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2017
Sep. 30, 2016
Oct. 02, 2015
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward      
Balance, beginning of year $ 44,167 $ 42,666 $ 41,923
Additions based on tax positions related to the current year 5,900 5,670 6,440
Additions for tax positions of prior years 237 367  
Reductions for tax positions of prior years (4,524) (2,451) (5,697)
Settlement (7,200) (2,085)  
Balance, end of year $ 38,580 $ 44,167 $ 42,666