CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jun. 29, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 397.3	$ 135.5	$ (36.4)
Other comprehensive income, net of tax:
Net change in cumulative translation adjustment	0.0	0.0	(0.6)
Net change in unrealized gain (loss) on available-for-sale securities	(2.5)	1.5	2.5
Net change in defined benefit obligations	2.8	(0.7)	(1.2)
Other comprehensive income, net of tax	0.3	0.8	0.7
Comprehensive income (loss), net of tax	$ 397.6	$ 136.3	$ (35.7)