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Stock-Based Compensation - Stock-Based Compensation Expense in Consolidated Statements of Operations (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 01, 2017
Jun. 25, 2016
Jul. 01, 2017
Jun. 25, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 14.4 $ 14.5 $ 53.4 $ 45.1
Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 2.3 2.2 8.7 6.9
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 2.2 2.4 9.1 7.3
Selling and marketing        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 3.4 2.5 9.3 7.8
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 6.5 $ 7.4 $ 26.3 $ 23.1