Income Taxes - Components of Net Deferred Taxes (Details) - USD ($) $ in Millions	Jun. 29, 2019	Jun. 30, 2018	Jul. 01, 2017
Gross deferred tax assets:
Tax credit carryforwards	$ 164.3	$ 158.8	$ 150.6
Net operating loss carryforwards	1,206.9	1,219.0	1,875.4
Capital loss carryforwards	63.9	63.9	102.4
Inventories	9.3	4.0	5.4
Accruals and reserves	56.0	20.7	28.4
Investments	0.5	0.5	0.7
Other	42.5	43.3	51.9
Acquisition-related items	42.1	31.5	55.5
Gross deferred tax assets	1,585.5	1,541.7	2,270.3
Valuation allowance	(1,405.3)	(1,382.1)	(2,095.0)
Deferred tax assets	180.2	159.6	175.3
Gross deferred tax liabilities:
Acquisition-related items	(33.5)	(26.8)	(6.5)
Undistributed foreign earnings	0.0	0.0	(3.0)
Foreign branch taxes	(22.0)	0.0	0.0
Other	(30.9)	(39.0)	(59.4)
Deferred tax liabilities	(86.4)	(65.8)	(68.9)
Total net deferred tax assets	$ 93.8	$ 93.8	$ 106.4