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Investments - Short-term Investments by Type (Details) - USD ($) $ in Millions	Dec. 27, 2020	Jun. 28, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 572.2	$ 782.0
Gross Unrealized Gains	8.4	8.9
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	580.6	790.9
Maximum
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses	(0.1)	(0.1)
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	126.5	130.0
Gross Unrealized Gains	2.3	2.0
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	128.8	132.0
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	398.9	473.8
Gross Unrealized Gains	5.7	6.3
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	404.6	480.1
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12.0	29.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	12.0	29.1
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23.3	52.3
Gross Unrealized Gains	0.4	0.6
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	23.7	52.9
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7.7	83.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	7.7	83.3
Variable rate demand note
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2.1	2.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	2.1	2.5
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1.7	11.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Credit Loss Allowance	0.0
Estimated Fair Value	$ 1.7	$ 11.0

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