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Investments - Short-term Investments by Type (Details) - USD ($) $ in Millions | Sep. 27, 2020 | Jun. 28, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 693.2 | $ 794.0
Gross Unrealized Gains | 9.0 | 8.9
Gross Unrealized Losses | (0.1) | 0.0
Credit Loss Allowance | 0.0 |
Estimated Fair Value | 702.1 | 802.9
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 119.6 | 130.0
Gross Unrealized Gains | 2.3 | 2.0
Gross Unrealized Losses | 0.0 | 0.0
Credit Loss Allowance | 0.0 |
Estimated Fair Value | 121.9 | 132.0
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 456.3 | 473.8
Gross Unrealized Gains | 6.2 | 6.3
Gross Unrealized Losses | 0.0 | 0.0
Credit Loss Allowance | 0.0 |
Estimated Fair Value | 462.5 | 480.1
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 18.2 | 29.1
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.1) | 0.0
Credit Loss Allowance | 0.0 |
Estimated Fair Value | 18.1 | 29.1
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 58.9 | 52.3
Gross Unrealized Gains | 0.5 | 0.6
Gross Unrealized Losses | 0.0 | 0.0
Credit Loss Allowance | 0.0 |
Estimated Fair Value | 59.4 | 52.9
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 33.7 | 95.3
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Credit Loss Allowance | 0.0 |
Estimated Fair Value | 33.7 | 95.3
Variable rate demand note |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 2.5
Gross Unrealized Gains |  | 0.0
Gross Unrealized Losses |  | 0.0
Estimated Fair Value | 0.0 | 2.5
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6.5 | 11.0
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Credit Loss Allowance | 0.0 |
Estimated Fair Value | $ 6.5 | $ 11.0

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