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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details) $ in Millions | Sep. 26, 2021 USD ($) security | Jun. 27, 2021 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 136.6 | $ 227.9
Greater than 12 Months | 0.0 | 0.0
Total | 136.6 | 227.9
Unrealized Loss |  |
Less than 12 Months | (0.2) | (0.4)
Greater than 12 Months | 0.0 | 0.0
Total | $ (0.2) | $ (0.4)
Number of securities with an unrealized loss |  |
Less than 12 Months | security | 75 | 134
Greater than 12 Months | security | 0 | 0
Total | security | 75 | 134
Municipal bonds |  |
Fair Value |  |
Less than 12 Months | $ 14.0 | $ 28.8
Greater than 12 Months | 0.0 | 0.0
Total | 14.0 | 28.8
Unrealized Loss |  |
Less than 12 Months | 0.0 | 0.0
Greater than 12 Months | 0.0 | 0.0
Total | 0.0 | 0.0
Corporate bonds |  |
Fair Value |  |
Less than 12 Months | 94.1 | 133.8
Greater than 12 Months | 0.0 | 0.0
Total | 94.1 | 133.8
Unrealized Loss |  |
Less than 12 Months | (0.2) | (0.3)
Greater than 12 Months | 0.0 | 0.0
Total | (0.2) | (0.3)
U.S. agency securities |  |
Fair Value |  |
Less than 12 Months | 7.7 | 16.7
Greater than 12 Months | 0.0 | 0.0
Total | 7.7 | 16.7
Unrealized Loss |  |
Less than 12 Months | 0.0 | 0.0
Greater than 12 Months | 0.0 | 0.0
Total | 0.0 | 0.0
U.S. treasury securities |  |
Fair Value |  |
Less than 12 Months | 20.8 | 47.9
Greater than 12 Months | 0.0 | 0.0
Total | 20.8 | 47.9
Unrealized Loss |  |
Less than 12 Months | 0.0 | (0.1)
Greater than 12 Months | 0.0 | 0.0
Total | $ 0.0 | (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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