CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Apr. 01, 2017	Apr. 02, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 26.0	$ 33.8	$ 153.2	$ (31.3)
Other comprehensive (loss) income:
Net change in cumulative translation adjustment, net of tax	9.1	3.4	(13.1)	(18.4)
Net change in available-for-sale investments, net of tax:
Unrealized holding gain arising during period	18.8	48.5	93.0	201.6
Less: reclassification adjustments included in net income (loss)	(51.2)	(38.8)	(185.4)	(38.8)
Net change in defined benefit obligation, net of tax:
Amortization of actuarial losses	0.5	0.2	1.4	0.5
Net change in Accumulated other comprehensive (loss) income	(22.8)	13.3	(104.1)	144.9
Comprehensive income	$ 3.2	$ 47.1	$ 49.1	$ 113.6