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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details) $ in Millions | Dec. 25, 2022 USD ($) security | Jun. 26, 2022 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 608.1 | $ 650.8
Greater than 12 Months | 184.0 | 9.3
Total | 792.1 | 660.1
Unrealized Loss |  |
Less than 12 Months | (16.4) | (22.6)
Greater than 12 Months | (10.0) | (0.4)
Total | $ (26.4) | $ (23.0)
Number of securities with an unrealized loss |  |
Less than 12 Months | security | 265 | 346
Greater than 12 Months | security | 90 | 5
Total | security | 355 | 351
Corporate bonds |  |
Fair Value |  |
Less than 12 Months | $ 361.0 | $ 431.1
Greater than 12 Months | 146.4 | 8.3
Total | 507.4 | 439.4
Unrealized Loss |  |
Less than 12 Months | (12.1) | (17.4)
Greater than 12 Months | (8.1) | (0.4)
Total | (20.2) | (17.8)
Municipal bonds |  |
Fair Value |  |
Less than 12 Months | 108.5 | 150.0
Greater than 12 Months | 35.7 | 1.0
Total | 144.2 | 151.0
Unrealized Loss |  |
Less than 12 Months | (3.2) | (4.4)
Greater than 12 Months | (1.8) | 0.0
Total | (5.0) | (4.4)
U.S. treasury securities |  |
Fair Value |  |
Less than 12 Months | 133.6 | 65.8
Greater than 12 Months | 0.0 | 0.0
Total | 133.6 | 65.8
Unrealized Loss |  |
Less than 12 Months | (1.1) | (0.7)
Greater than 12 Months | 0.0 | 0.0
Total | (1.1) | (0.7)
U.S. agency securities |  |
Fair Value |  |
Less than 12 Months | 5.0 | 3.9
Greater than 12 Months | 1.9 | 0.0
Total | 6.9 | 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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