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Stock-Based Compensation - Total Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 27, 2020
Dec. 29, 2019
Employee Service share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense $ 13.7 $ 11.6 $ 27.4 $ 27.1
Cost of revenue, net        
Employee Service share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense 3.7 2.4 7.1 4.4
Research and development        
Employee Service share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense 2.2 2.0 4.6 4.1
Sales, general and administrative        
Employee Service share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense $ 7.8 $ 7.2 $ 15.7 $ 18.6