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Fair Value of Financial Instruments
 12 Months Ended
Jun. 25, 2023
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments
Under U.S. GAAP, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., the exit price) in an orderly transaction between market participants at the measurement date. In determining fair value, the Company uses various valuation approaches, including quoted market prices and discounted cash flows. U.S. GAAP also establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are obtained from independent sources and can be validated by a third party, whereas unobservable inputs reflect assumptions regarding what a third party would use in pricing an asset or liability. The fair value hierarchy is categorized into three levels based on the reliability of inputs as follows:
•Level 1 - Valuations based on quoted prices in active markets for identical instruments that the Company is able to access. Because valuations are based on quoted prices that are readily and regularly available in an active market, valuation of these products does not entail a significant degree of judgment.
•Level 2 - Valuations based on quoted prices in active markets for instruments that are similar, or quoted prices in markets that are not active for identical or similar instruments, and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets.
•Level 3 - Valuations based on inputs that are unobservable and significant to the overall fair value measurement.
The financial assets for which the Company performs recurring fair value remeasurements are cash equivalents and short-term investments. As of June 25, 2023, financial assets utilizing Level 1 inputs included U.S. treasury securities and money market funds, and financial assets utilizing Level 2 inputs included municipal bonds, corporate bonds, U.S. agency securities, commercial paper and variable rate demand notes. Level 2 assets are valued based on quoted prices in active markets for instruments that are similar or using a third-party pricing service’s consensus price, which is a weighted average price based on multiple sources. These sources determine prices utilizing market income models which factor in, where applicable, transactions of similar assets in active markets, transactions of identical assets in infrequent markets, interest rates, bond or credit default swap spreads and volatility. The Company did not have any financial assets requiring the use of Level 3 inputs as of June 25, 2023. There were no transfers between Level 1 and Level 2 during the year ended June 25, 2023.
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