CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 28, 2024	Dec. 30, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (60.9)	$ (99.1)	$ (143.3)	$ (167.0)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(0.3)	0.2	(0.3)	0.0
Net change in unrealized gain on available-for-sale securities	(1.1)	3.8	1.2	5.1
Other comprehensive income (loss), net of tax	(1.4)	4.0	0.9	5.1
Comprehensive loss, net of tax	$ (62.3)	$ (95.1)	$ (142.4)	$ (161.9)