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Balance Sheet and Other Details - Interest and Other Income, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jul. 02, 2016
Balance Sheet and Other Details
Interest income	$ 15.9	$ 11.1	$ 5.9
Foreign exchange gains (loss), net	(1.3)	0.9	(2.6)
Loss on extinguishment of debt	(5.0)	(1.1)	0.0
Other income (expense), net	0.1	2.2	(0.8)
Interest and other income, net	9.7	13.1	2.5
Debt Instrument [Line Items]
Loss on extinguishment of debt	5.0	$ 1.1	$ 0.0
0.625% Senior Convertible Notes | Convertible Debt
Balance Sheet and Other Details
Loss on extinguishment of debt	(5.0)
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ 5.0

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