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Investments - Short-term Investments by Type (Details) - USD ($) $ in Millions	Dec. 29, 2019	Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 567.3	$ 548.4
Gross Unrealized Gains	1.7	2.6
Gross Unrealized Losses	(0.1)	(0.1)
Estimated Fair Value	568.9	550.9
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	50.7	78.2
Gross Unrealized Gains	0.4	0.4
Gross Unrealized Losses	0.0	(0.1)
Estimated Fair Value	51.1	78.5
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	326.5	256.0
Gross Unrealized Gains	1.2	1.0
Gross Unrealized Losses	(0.1)	0.0
Estimated Fair Value	327.6	257.0
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	21.5	25.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	21.5	25.6
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	96.3	92.4
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	96.4	92.5
Certificates of deposit | Non-US
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45.6	49.1
Gross Unrealized Gains	0.0	1.1
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	45.6	50.2
Certificates of deposit | United States
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20.6	22.4
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	20.6	22.4
Variable rate demand note
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		16.9
Gross Unrealized Gains		0.0
Gross Unrealized Losses		0.0
Estimated Fair Value	0.0	16.9
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6.1	7.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	$ 6.1	$ 7.8

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