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Stock-Based Compensation - Stock-Based Compensation Expense in Consolidated Statements of Operations (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2017
Mar. 26, 2016
Apr. 01, 2017
Mar. 26, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 19.8 $ 14.7 $ 39.0 $ 30.6
Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 3.6 2.5 6.4 4.7
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 4.1 2.6 6.9 5.0
Selling and marketing        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 3.2 2.7 5.9 5.2
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 8.9 $ 6.9 $ 19.8 $ 15.7