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Share-based Payments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Cash paid to taxing authorities as a result of withholding shares for the exercise of employee stock awards $ 13,780 $ 5,053
ASU No 2016-09    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Excess tax benefits related to share-based payments 900  
Cash paid to taxing authorities as a result of withholding shares for the exercise of employee stock awards 13,800 $ 5,100
ASU No 2016-09 | Retained Earnings    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Cumulative effect of change in accounting principle for share-based compensation award forfeitures $ 1,800