CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 47.4	$ 7.1
Other comprehensive income (loss), net of tax:
Net change in cumulative translation adjustment	0.1	1.9
Net change in unrealized gain (loss) on available-for-sale securities	0.4	(0.1)
Other comprehensive income, net of tax	0.5	1.8
Comprehensive income (loss), net of tax	$ 47.9	$ 8.9