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Investments (Tables)
 12 Months Ended
Jun. 29, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Short-term Investments
Short-term investments as of June 29, 2025 consist of the following:
 June 29, 2025
(in millions of U.S. Dollars)Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
Corporate bonds$196.8 $0.3 ($1.5)$— $195.6 
U.S. treasury securities192.0 0.1 — — 192.1 
Municipal bonds79.5 0.2 (0.5)— 79.2 
Certificates of deposit5.0 — — — 5.0 
Commercial paper16.3 — — — 16.3 
Total short-term investments$489.6 $0.6 ($2.0)$— $488.2 
Short-term investments as of June 30, 2024 consist of the following:
 June 30, 2024
(in millions of U.S. Dollars)Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
U.S. treasury securities$553.3 $— $(0.6)$— $552.7 
Corporate bonds423.5 0.2 (6.7)— 417.0 
Municipal bonds102.8 — (2.0)— 100.8 
Certificates of deposit31.5 — — — 31.5 
Commercial paper16.7 — — — 16.7 
U.S. agency securities10.0 — — — 10.0 
Total short-term investments$1,137.8 $0.2 $(9.3)$— $1,128.7 
Schedule of Gross Unrealized Losses and Fair Value of Short-term Investments by Type and Length of Time
The following table presents the gross unrealized losses and estimated fair value of the Company’s short-term investments, aggregated by investment type and the length of time that individual securities have been in a continuous unrealized loss position:
 June 29, 2025
 Less than 12 MonthsGreater than 12 MonthsTotal
(in millions of U.S. Dollars)Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Corporate bonds$28.7 $— $65.2 ($1.5)$93.9 ($1.5)
U.S. treasury securities90.6 — — — 90.6 — 
Municipal bonds6.2 — 41.3 (0.5)47.5 (0.5)
Total$125.5 $— $106.5 ($2.0)$232.0 ($2.0)
Number of securities with an unrealized loss54 25 79 
The following table presents the gross unrealized losses and estimated fair value of the Company’s short-term investments, aggregated by investment type and the length of time that individual securities have been in a continuous unrealized loss position:
 June 30, 2024
 Less than 12 MonthsGreater than 12 MonthsTotal
(in millions of U.S. Dollars)Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Corporate bonds$135.2 ($0.2)$183.4 ($6.5)$318.6 ($6.7)
Municipal bonds9.0 — 74.3 (2.0)83.3 (2.0)
U.S. treasury securities507.4 (0.4)35.9 (0.2)543.3 (0.6)
U.S. agency securities14.9 — 10.0 — 24.9 — 
Total$666.5 ($0.6)$303.6 ($8.7)$970.1 ($9.3)
Number of securities with an unrealized loss141 66 207 
Schedule of Contractual Maturities of Short-term Investments by Type
The contractual maturities of short-term investments at June 29, 2025 were as follows:
(in millions of U.S. Dollars)Within One YearAfter One, Within Five YearsAfter Five, Within Ten YearsAfter Ten YearsTotal
Corporate bonds$137.0 $58.6 $— $— $195.6 
U.S. treasury securities176.4 15.7 — — 192.1 
Municipal bonds53.0 23.8 — 2.4 79.2 
Certificates of deposit5.0 — — — 5.0 
Commercial paper16.3 — — — 16.3 
Total short-term investments$387.7 $98.1 $— $2.4 $488.2