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Investments - Short-term Investments by Type (Details) - USD ($) | Sep. 26, 2021 | Jun. 27, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 592,000,000.0 | $ 770,500,000
Gross Unrealized Gains | 4,500,000 | 5,500,000
Gross Unrealized Losses | (200,000) | (400,000)
Credit Loss Allowance | 0 | 0
Estimated Fair Value | 596,300,000 | 775,600,000
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 135,700,000 | 139,400,000
Gross Unrealized Gains | 1,700,000 | 1,900,000
Gross Unrealized Losses | 0 | 0
Credit Loss Allowance | 0 | 0
Estimated Fair Value | 137,400,000 | 141,300,000
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 366,900,000 | 456,500,000
Gross Unrealized Gains | 2,600,000 | 3,300,000
Gross Unrealized Losses | (200,000) | (300,000)
Credit Loss Allowance | 0 | 0
Estimated Fair Value | 369,300,000 | 459,500,000
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 13,800,000 | 15,800,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Credit Loss Allowance | 0 | 0
Estimated Fair Value | 13,800,000 | 15,800,000
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 46,100,000 | 72,300,000
Gross Unrealized Gains | 200,000 | 300,000
Gross Unrealized Losses | 0 | (100,000)
Credit Loss Allowance | 0 | 0
Estimated Fair Value | 46,300,000 | 72,500,000
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,500,000 | 16,500,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Credit Loss Allowance | 0 | 0
Estimated Fair Value | 9,500,000 | 16,500,000
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 50,000,000.0
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Credit Loss Allowance |  | 0
Estimated Fair Value |  | 50,000,000.0
Variable rate demand notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20,000,000.0 | 20,000,000.0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Credit Loss Allowance | 0 | 0
Estimated Fair Value | $ 20,000,000.0 | $ 20,000,000.0

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