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Investments - Short-term Investments by Type (Details) - USD ($)	Mar. 28, 2021	Jun. 28, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 755,800,000	$ 782,000,000.0
Gross Unrealized Gains	6,100,000	8,900,000
Gross Unrealized Losses	(200,000)	0
Allowance for credit loss	0
Estimated Fair Value	761,700,000	790,900,000
Maximum
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses		(100,000)
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	135,600,000	130,000,000.0
Gross Unrealized Gains	2,000,000.0	2,000,000.0
Gross Unrealized Losses	0	0
Allowance for credit loss	0
Estimated Fair Value	137,600,000	132,000,000.0
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	470,500,000	473,800,000
Gross Unrealized Gains	3,800,000	6,300,000
Gross Unrealized Losses	(200,000)	0
Allowance for credit loss	0
Estimated Fair Value	474,100,000	480,100,000
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,300,000	29,100,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Allowance for credit loss	0
Estimated Fair Value	15,300,000	29,100,000
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	69,400,000	52,300,000
Gross Unrealized Gains	300,000	600,000
Gross Unrealized Losses	0	0
Allowance for credit loss	0
Estimated Fair Value	69,700,000	52,900,000
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,800,000	83,300,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Allowance for credit loss	0
Estimated Fair Value	12,800,000	83,300,000
Variable rate demand note
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,000,000.0	2,500,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Allowance for credit loss	0
Estimated Fair Value	11,000,000.0	2,500,000
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	41,200,000	11,000,000.0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Allowance for credit loss	0
Estimated Fair Value	$ 41,200,000	$ 11,000,000.0

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