CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 49.1	$ 16.3	$ 96.7	$ 63.7
Other comprehensive income (loss), net of tax:
Net change in cumulative translation adjustment	0.0	(0.7)	0.0	(0.6)
Net change in unrealized gain (loss) on available-for-sale securities	(0.2)	0.1	(0.1)	0.5
Net change in defined benefit obligations	0.0	(0.1)	0.0	(0.1)
Other comprehensive loss, net of tax	(0.2)	(0.7)	(0.1)	(0.2)
Comprehensive income, net of tax	$ 48.9	$ 15.6	$ 96.6	$ 63.5