CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jul. 02, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (546.5)	$ (131.6)	$ 198.9
Other comprehensive income (loss), net of tax:
Net change in cumulative translation adjustment	(0.6)	0.7	0.0
Net change in unrealized gain (loss) on available-for-sale securities	4.7	4.4	(10.2)
Net change in defined benefit obligations	1.1	(1.4)	2.4
Other comprehensive income (loss), net of tax	5.2	3.7	(7.8)
Comprehensive income (loss), net of tax	$ (541.3)	$ (127.9)	$ 191.1