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Investments - Short-term Investments by Type (Details) - USD ($)	Dec. 26, 2021	Jun. 27, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 500,400,000	$ 770,500,000
Gross Unrealized Gains	2,300,000	5,500,000
Gross Unrealized Losses	(1,600,000)	(400,000)
Credit Loss Allowance	0	0
Estimated Fair Value	501,100,000	775,600,000
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	132,400,000	139,400,000
Gross Unrealized Gains	1,100,000	1,900,000
Gross Unrealized Losses	(300,000)	0
Credit Loss Allowance	0	0
Estimated Fair Value	133,200,000	141,300,000
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	312,400,000	456,500,000
Gross Unrealized Gains	1,100,000	3,300,000
Gross Unrealized Losses	(1,300,000)	(300,000)
Credit Loss Allowance	0	0
Estimated Fair Value	312,200,000	459,500,000
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,000,000.0	15,800,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Credit Loss Allowance	0	0
Estimated Fair Value	4,000,000.0	15,800,000
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,700,000	72,300,000
Gross Unrealized Gains	100,000	300,000
Gross Unrealized Losses	0	(100,000)
Credit Loss Allowance	0	0
Estimated Fair Value	12,800,000	72,500,000
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		16,500,000
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Credit Loss Allowance		0
Estimated Fair Value		16,500,000
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	21,000,000.0	50,000,000.0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Credit Loss Allowance	0	0
Estimated Fair Value	21,000,000.0	50,000,000.0
Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,900,000	20,000,000.0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Credit Loss Allowance	0	0
Estimated Fair Value	$ 17,900,000	$ 20,000,000.0

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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