Investments - Marketable Investments by Type (Details) - USD ($)	Jun. 25, 2023	Jun. 26, 2022	Jun. 27, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,220,600,000	$ 772,200,000
Gross Unrealized Gains	0	100,000
Gross Unrealized Losses	(22,700,000)	(23,000,000.0)
Credit Loss Allowance	0	0	$ 0
Estimated Fair Value	1,197,900,000	749,300,000
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	512,300,000	465,800,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(16,700,000)	(17,800,000)
Credit Loss Allowance	0	0
Estimated Fair Value	495,600,000	448,000,000.0
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	261,800,000	66,500,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,400,000)	(700,000)
Credit Loss Allowance	0	0
Estimated Fair Value	260,400,000	65,800,000
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	179,700,000	166,500,000
Gross Unrealized Gains	0	100,000
Gross Unrealized Losses	(4,400,000)	(4,400,000)
Credit Loss Allowance	0	0
Estimated Fair Value	175,300,000	162,200,000
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	112,300,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Credit Loss Allowance	0
Estimated Fair Value	112,300,000
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	77,000,000.0	4,000,000.0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(200,000)	(100,000)
Credit Loss Allowance	0	0
Estimated Fair Value	76,800,000	3,900,000
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	50,200,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Credit Loss Allowance	0
Estimated Fair Value	50,200,000
Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	27,300,000	69,400,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Credit Loss Allowance	0	0
Estimated Fair Value	$ 27,300,000	$ 69,400,000