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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details) $ in Millions | Mar. 26, 2023 USD ($) security | Jun. 26, 2022 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 279.7 | $ 650.8
Greater than 12 Months | 497.9 | 9.3
Total | 777.6 | 660.1
Unrealized Loss |  |
Less than 12 Months | (0.6) | (22.6)
Greater than 12 Months | (20.8) | (0.4)
Total | $ (21.4) | $ (23.0)
Number of securities with an unrealized loss |  |
Less than 12 Months | security | 67 | 346
Greater than 12 Months | security | 262 | 5
Total | security | 329 | 351
Corporate bonds |  |
Fair Value |  |
Less than 12 Months | $ 176.5 | $ 431.1
Greater than 12 Months | 352.4 | 8.3
Total | 528.9 | 439.4
Unrealized Loss |  |
Less than 12 Months | (0.5) | (17.4)
Greater than 12 Months | (16.3) | (0.4)
Total | (16.8) | (17.8)
Municipal bonds |  |
Fair Value |  |
Less than 12 Months | 22.1 | 150.0
Greater than 12 Months | 112.4 | 1.0
Total | 134.5 | 151.0
Unrealized Loss |  |
Less than 12 Months | (0.1) | (4.4)
Greater than 12 Months | (3.7) | 0.0
Total | (3.8) | (4.4)
U.S. treasury securities |  |
Fair Value |  |
Less than 12 Months | 54.6 | 65.8
Greater than 12 Months | 31.2 | 0.0
Total | 85.8 | 65.8
Unrealized Loss |  |
Less than 12 Months | 0.0 | (0.7)
Greater than 12 Months | (0.7) | 0.0
Total | (0.7) | (0.7)
U.S. agency securities |  |
Fair Value |  |
Less than 12 Months | 26.5 | 3.9
Greater than 12 Months | 1.9 | 0.0
Total | 28.4 | 3.9
Unrealized Loss |  |
Less than 12 Months | 0.0 | (0.1)
Greater than 12 Months | (0.1) | 0.0
Total | $ (0.1) | $ (0.1)

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