Stock-Based Compensation - Stock-Based Compensation by Function (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Jun. 27, 2020	Jun. 29, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 44.6	$ 38.2	$ 30.5
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 4.3	$ 3.8			3.3
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	7.7	6.1			4.9
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 32.6	$ 28.3			$ 22.3