CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	12 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 28.7	$ 5.4	$ (48.6)
Other comprehensive loss:
Net change in cumulative translation adjustment, net of tax	(28.6)	(27.0)	(8.5)
Net change in available-for-sale investments, net of tax:
Unrealized holding gains (losses) arising during period	(0.1)	0.3	(0.6)
Less: reclassification adjustments included in net income	0.0	0.5	0.1
Net change in defined benefit obligation, net of tax:
Unrealized actuarial losses arising during period	(5.4)	(7.3)	(2.8)
Amortization of actuarial losses	2.8	1.8	1.5
Net change in accumulated other comprehensive loss	(31.3)	(31.7)	(10.3)
Comprehensive loss	$ (2.6)	$ (26.3)	$ (58.9)