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Investments
3 Months Ended
Sep. 26, 2021
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Investments consist of municipal bonds, corporate bonds, U.S. agency securities, U.S. treasury securities, certificates of deposit, commercial paper and variable rate demand notes. All short-term investments are classified as available-for-sale.
Short-term investments as of September 26, 2021 and June 27, 2021 consisted of the following:
 September 26, 2021
 Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
Municipal bonds$135.7 $1.7 $— $— $137.4 
Corporate bonds366.9 2.6 (0.2)— 369.3 
U.S. agency securities13.8 — — — 13.8 
U.S. treasury securities46.1 0.2 — — 46.3 
Certificates of deposit9.5 — — — 9.5 
Variable rate demand notes20.0 — — — 20.0 
Total short-term investments$592.0 $4.5 ($0.2)$— $596.3 
 June 27, 2021
 Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
Municipal bonds$139.4 $1.9 $— $— $141.3 
Corporate bonds456.5 3.3 (0.3)— 459.5 
U.S. agency securities15.8 — — — 15.8 
U.S. treasury securities72.3 0.3 (0.1)— 72.5 
Certificates of deposit16.5 — — — 16.5 
Commercial paper50.0 — — — 50.0 
Variable rate demand notes20.0 — — — 20.0 
Total short-term investments$770.5 $5.5 ($0.4)$— $775.6 
The Company does not include accrued interest in estimated fair values of short-term investments and does not record an allowance for credit losses on receivables related to accrued interest. Accrued interest receivable was $4.1 million and $5.5 million as of September 26, 2021 and June 27, 2021, respectively, and is recorded in other current assets on the consolidated balance sheets. When necessary, write offs of noncollectable interest income are recorded as a reversal to interest income. There were no write offs of noncollectable interest income during the three months ended September 26, 2021 and September 27, 2020.
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:
September 26, 2021
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Municipal bonds$14.0 $— $— $— $14.0 $— 
Corporate bonds94.1 (0.2)— — 94.1 (0.2)
U.S. agency securities7.7 — — — 7.7 — 
U.S. treasury securities20.8 — — — 20.8 — 
Total$136.6 ($0.2)$— $— $136.6 ($0.2)
Number of securities with an unrealized loss75 — 75 
June 27, 2021
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Municipal bonds$28.8 $— $— $— $28.8 $— 
Corporate bonds133.8 (0.3)— — 133.8 (0.3)
U.S. agency securities16.7 — — — 16.7 — 
U.S. treasury securities47.9 (0.1)— — 47.9 (0.1)
Certificates of deposit0.7 — — — 0.7 — 
Total$227.9 ($0.4)$— $— $227.9 ($0.4)
Number of securities with an unrealized loss134 — 134 
The Company utilizes specific identification in computing realized gains and losses on the sale of investments. Realized gains of $0.2 million and less than $0.1 million for the three months ended September 26, 2021 and September 27, 2020, respectively, are included in non-operating expense, net in the consolidated statements of operations. Unrealized gains and losses are included as a separate component of equity, net of tax, unless the Company determines there is an expected credit loss.
The Company evaluates its investments for expected credit losses. The Company believes it is able to and intends to hold each of the investments held with an unrealized loss as of September 26, 2021 until the investments fully recover in market value. No allowance for credit losses was recorded as of September 26, 2021.
The contractual maturities of short-term investments as of September 26, 2021 were as follows:

 
 Within One YearAfter One, Within Five YearsAfter Five, Within Ten YearsAfter Ten YearsTotal
Municipal bonds$27.5 $109.9 $— $— $137.4 
Corporate bonds65.5 303.8 — — 369.3 
U.S. agency securities5.5 8.3 — — 13.8 
U.S. treasury securities16.6 29.7 — — 46.3 
Certificates of deposit9.5 — — — 9.5 
Variable rate demand notes— — — 20.0 20.0 
Total short-term investments$124.6 $451.7 $— $20.0 $596.3