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Fair Value of Financial Instruments (Tables)
12 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Carried at Fair Value
Financial instruments carried at fair value were as follows:
 June 30, 2024June 25, 2023
(in millions of U.S. Dollars)Level 1Level 2TotalLevel 1Level 2Total
Assets:
Cash equivalents:
Money market funds$87.3 $— $87.3 $230.4 $— $230.4 
U.S. treasury securities10.0 — 10.0 20.7 — 20.7 
Commercial paper— — — — 7.0 7.0 
Total cash equivalents97.3 — 97.3 251.1 7.0 258.1 
Short-term investments:
Corporate bonds— 417.0 417.0 — 495.6 495.6 
U.S. treasury securities552.7 — 552.7 260.4 — 260.4 
Municipal bonds— 100.8 100.8 — 175.3 175.3 
Certificates of deposit— 31.5 31.5 — 112.3 112.3 
U.S. agency securities— 10.0 10.0 — 76.8 76.8 
Commercial paper— 16.7 16.7 — 50.2 50.2 
Variable rate demand notes— — — — 27.3 27.3 
Total short-term investments552.7 576.0 1,128.7 260.4 937.5 1,197.9 
Other long-term investments:
Common stock of U.S. corporation79.3 — 79.3 — — — 
Total other long-term investments79.3 — 79.3 — — — 
Total assets$729.3 $576.0 $1,305.3 $511.5 $944.5 $1,456.0