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Employee Stock Purchase and Stock Option Plans (Narrative) (Details)
$ in Millions
12 Months Ended
Jan. 18, 2017
USD ($)
employee
Sep. 28, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Proceeds from stock options exercised   $ 29.8
Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of employees affected due to modification | employee 786  
Incremental compensation cost due to modification $ 1.1