CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Dec. 31, 2022	Jan. 01, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (31.7)	$ 56.7	$ (32.1)	$ 138.2
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) on available-for-sale securities	3.6	(2.3)	3.0	(2.0)
Other comprehensive income (loss), net of tax	3.6	(2.3)	3.0	(2.0)
Comprehensive income (loss), net of tax	$ (28.1)	$ 54.4	$ (29.1)	$ 136.2