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Investments (Tables)
 9 Months Ended
Mar. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Short-term Investments by Type
(in millions of U.S. Dollars)
March 30, 2025
 Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
U.S. treasury securities$224.7 $0.1 $— $— $224.8 
Corporate bonds263.7 0.4 (2.0)— 262.1 
Municipal bonds93.1 0.1 (0.7)— 92.5 
Certificates of deposit17.0 — — — 17.0 
Commercial paper3.0 — — — 3.0 
Total short-term investments$601.5 $0.6 ($2.7)$— $599.4 
 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 tables present 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 (in millions of U.S. Dollars):
March 30, 2025
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Corporate bonds$82.5 ($0.6)$48.1 ($1.4)$130.6 ($2.0)
U.S. treasury securities37.9 — — — 37.9 — 
Municipal bonds32.3 (0.2)23.2 (0.5)55.5 (0.7)
Total$152.7 ($0.8)$71.3 ($1.9)$224.0 ($2.7)
Number of securities with an unrealized loss55 31 86 
June 30, 2024
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Corporate bonds$135.2 ($0.2)$183.4 ($6.5)$318.6 ($6.7)
U.S. treasury securities507.4 (0.4)35.9 (0.2)543.3 (0.6)
Municipal bonds9.0 — 74.3 (2.0)83.3 (2.0)
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 as of March 30, 2025 were as follows:
(in millions of U.S. Dollars)Within One YearAfter One, Within Five YearsAfter Ten YearsTotal
U.S. treasury securities$210.0 $14.8 $— $224.8 
Corporate bonds190.2 71.9 — 262.1 
Municipal bonds54.8 35.3 2.4 92.5 
Certificates of deposit17.0 — — 17.0 
Commercial paper3.0 — — 3.0 
Total short-term investments$475.0 $122.0 $2.4 $599.4