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Investments - Short-term Investments by Type (Details) - USD ($) $ in Millions	Sep. 27, 2020	Jun. 28, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 693.2	$ 794.0
Gross Unrealized Gains	9.0	8.9
Gross Unrealized Losses	(0.1)	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	702.1	802.9
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	119.6	130.0
Gross Unrealized Gains	2.3	2.0
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	121.9	132.0
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	456.3	473.8
Gross Unrealized Gains	6.2	6.3
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	462.5	480.1
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18.2	29.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	18.1	29.1
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	58.9	52.3
Gross Unrealized Gains	0.5	0.6
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	59.4	52.9
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	33.7	95.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	33.7	95.3
Variable rate demand note
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		2.5
Gross Unrealized Gains		0.0
Gross Unrealized Losses		0.0
Estimated Fair Value	0.0	2.5
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6.5	11.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	$ 6.5	$ 11.0

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