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Fair Value of Financial Instruments (Tables)
12 Months Ended
Jun. 25, 2023
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Carried at Fair Value
Financial instruments carried at fair value were as follows:
 June 25, 2023June 26, 2022
(in millions of U.S. Dollars)Level 1Level 2TotalLevel 1Level 2Total
Assets:
Cash equivalents:
Money market funds$230.4 $— $230.4 $115.9 $— $115.9 
U.S. treasury securities20.7 — 20.7 69.0 — 69.0 
Commercial paper— 7.0 7.0 — 59.4 59.4 
Total cash equivalents251.1 7.0 258.1 184.9 59.4 244.3 
Short-term investments:
Corporate bonds— 495.6 495.6 — 448.0 448.0 
U.S. treasury securities260.4 — 260.4 65.8 — 65.8 
Municipal bonds— 175.3 175.3 — 162.2 162.2 
Certificates of deposit— 112.3 112.3 — — — 
U.S. agency securities— 76.8 76.8 — 3.9 3.9 
Commercial paper— 50.2 50.2 — — — 
Variable rate demand notes— 27.3 27.3 — 69.4 69.4 
Total short-term investments260.4 937.5 1,197.9 65.8 683.5 749.3 
Total assets$511.5 $944.5 $1,456.0 $250.7 $742.9 $993.6