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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details) $ in Millions | Jun. 26, 2022 USD ($) security | Jun. 27, 2021 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 650.8 | $ 206.5
Greater than 12 Months | 9.3 | 0.0
Total | 660.1 | 206.5
Unrealized Loss |  |
Less than 12 Months | (22.6) | (0.4)
Greater than 12 Months | (0.4) | 0.0
Total | $ (23.0) | $ (0.4)
Number of securities with an unrealized loss |  |
Less than 12 Months | security | 346 | 128
Greater than 12 Months | security | 5 | 0
Total | security | 351 | 128
Municipal bonds |  |
Fair Value |  |
Less than 12 Months | $ 150.0 | $ 13.4
Greater than 12 Months | 1.0 | 0.0
Total | 151.0 | 13.4
Unrealized Loss |  |
Less than 12 Months | (4.4) | 0.0
Greater than 12 Months | 0.0 | 0.0
Total | (4.4) | 0.0
Corporate bonds |  |
Fair Value |  |
Less than 12 Months | 431.1 | 133.8
Greater than 12 Months | 8.3 | 0.0
Total | 439.4 | 133.8
Unrealized Loss |  |
Less than 12 Months | (17.4) | (0.3)
Greater than 12 Months | (0.4) | 0.0
Total | (17.8) | (0.3)
U.S. agency securities |  |
Fair Value |  |
Less than 12 Months | 3.9 | 10.7
Greater than 12 Months | 0.0 | 0.0
Total | 3.9 | 10.7
Unrealized Loss |  |
Less than 12 Months | (0.1) | 0.0
Greater than 12 Months | 0.0 | 0.0
Total | (0.1) | 0.0
U.S. treasury securities |  |
Fair Value |  |
Less than 12 Months | 65.8 | 47.9
Greater than 12 Months | 0.0 | 0.0
Total | 65.8 | 47.9
Unrealized Loss |  |
Less than 12 Months | (0.7) | (0.1)
Greater than 12 Months | 0.0 | 0.0
Total | $ (0.7) | (0.1)
Certificates of deposit |  |
Fair Value |  |
Less than 12 Months |  | 0.7
Greater than 12 Months |  | 0.0
Total |  | 0.7
Unrealized Loss |  |
Less than 12 Months |  | 0.0
Greater than 12 Months |  | 0.0
Total |  | $ 0.0

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