CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - 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 (loss)	$ 28.0	$ 13.0	$ 34.8	$ (2.3)
Other comprehensive (loss) income:
Net change in cumulative translation adjustment, net of tax	28.0	(13.0)	0.6	(26.1)
Net change in available-for-sale investments, net of tax:
Unrealized holding gain arising during period	0.0	0.0	0.0	0.2
Plus: reclassification adjustments included in net loss	0.0	0.2	0.0	0.4
Net change in defined benefit obligation, net of tax:
Amortization of actuarial losses	0.8	0.4	1.5	1.0
Net change in accumulated other comprehensive income (loss)	28.8	(12.4)	2.1	(24.5)
Comprehensive income (loss)	$ 56.8	$ 0.6	$ 36.9	$ (26.8)