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Investments (Tables)
 3 Months Ended
Sep. 24, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Short-term Investments by Type
Short-term investments consisted of the following (in millions of U.S. Dollars):
 September 24, 2023
 Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
U.S. treasury securities$691.6 $— ($1.3)$— $690.3 
Corporate bonds483.8 — (15.0)— 468.8 
Municipal bonds146.0 — (4.3)— 141.7 
Commercial paper127.9 — — — 127.9 
U.S. agency securities72.8 — (0.2)— 72.6 
Certificates of deposit57.1 — — — 57.1 
Variable rate demand notes27.2 — — — 27.2 
Total short-term investments$1,606.4 $— ($20.8)$— $1,585.6 
 June 25, 2023
 Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
Corporate bonds$512.3 $— ($16.7)$— $495.6 
U.S. treasury securities261.8 — (1.4)— 260.4 
Municipal bonds179.7 — (4.4)— 175.3 
Certificates of deposit112.3 — — — 112.3 
U.S. agency securities77.0 — (0.2)— 76.8 
Commercial paper50.2 — — — 50.2 
Variable rate demand notes27.3 — — — 27.3 
Total short-term investments$1,220.6 $— ($22.7)$— $1,197.9 
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):
September 24, 2023
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
U.S. treasury securities$631.5 ($0.7)$26.3 ($0.7)$657.8 ($1.4)
Corporate bonds157.5 (0.5)292.2 (14.4)449.7 (14.9)
Municipal bonds43.2 (0.2)93.7 (4.1)136.9 (4.3)
U.S. agency securities70.6 (0.2)2.0 — 72.6 (0.2)
Commercial Paper4.0 — — — 4.0 — 
Total$906.8 ($1.6)$414.2 ($19.2)$1,321.0 ($20.8)
Number of securities with an unrealized loss119 209 328 
June 25, 2023
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Corporate bonds$151.5 ($0.5)$324.1 ($16.2)$475.6 ($16.7)
U.S. treasury securities229.3 (0.5)31.1 (0.9)260.4 (1.4)
Municipal bonds61.4 (0.4)105.9 (4.0)167.3 (4.4)
U.S. agency securities74.8 (0.2)2.0 — 76.8 (0.2)
Commercial Paper3.9 — — — 3.9 — 
Total$520.9 ($1.6)$463.1 ($21.1)$984.0 ($22.7)
Number of securities with an unrealized loss95 234 329 
Schedule of Contractual Maturities of Short-term Investments by Type
The contractual maturities of short-term investments as of September 24, 2023 were as follows:

 
(in millions of U.S. Dollars)Within One YearAfter One, Within Five YearsAfter Five, Within Ten YearsAfter Ten YearsTotal
U.S. treasury securities$591.4 $98.9 $— $— $690.3 
Corporate bonds218.1 250.7 — — 468.8 
Municipal bonds58.1 81.2 — 2.4 141.7 
Commercial paper127.9 — — — 127.9 
U.S. agency securities72.6 — — — 72.6 
Certificates of deposit57.1 — — — 57.1 
Variable rate demand notes— — 9.7 17.5 27.2 
Total short-term investments$1,125.2 $430.8 $9.7 $19.9 $1,585.6