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Investments
6 Months Ended
Dec. 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 December 26, 2021 and June 27, 2021 consisted of the following:
 December 26, 2021
 Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
Municipal bonds$132.4 $1.1 ($0.3)$— $133.2 
Corporate bonds312.4 1.1 (1.3)— 312.2 
U.S. agency securities4.0 — — — 4.0 
U.S. treasury securities12.7 0.1 — — 12.8 
Commercial paper21.0 — — — 21.0 
Variable rate demand notes17.9 — — — 17.9 
Total short-term investments$500.4 $2.3 ($1.6)$— $501.1 
 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 $3.9 million and $5.5 million as of December 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 and six months ended December 26, 2021 and December 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:
December 26, 2021
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Municipal bonds$41.8 ($0.3)$— $— $41.8 ($0.3)
Corporate bonds180.3 (1.3)— — 180.3 (1.3)
U.S. agency securities4.0 — — — 4.0 — 
U.S. treasury securities2.0 — — — 2.0 — 
Total$228.1 ($1.6)$— $— $228.1 ($1.6)
Number of securities with an unrealized loss111 — 111 
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 $0.1 million and $0.3 million for the three and six months ended December 26, 2021, respectively, and $0.2 million and $0.2 million for the three and six months ended December 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 December 26, 2021 until the investments fully recover in market value. No allowance for credit losses was recorded as of December 26, 2021.
The contractual maturities of short-term investments as of December 26, 2021 were as follows:

 
 Within One YearAfter One, Within Five YearsAfter Five, Within Ten YearsAfter Ten YearsTotal
Municipal bonds$36.4 $96.8 $— $— $133.2 
Corporate bonds58.9 253.3 — — 312.2 
U.S. agency securities2.0 2.0 — — 4.0 
U.S. treasury securities4.0 8.8 — — 12.8 
Commercial paper21.0 — — — 21.0 
Variable rate demand notes— — — 17.9 17.9 
Total short-term investments$122.3 $360.9 $— $17.9 $501.1