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Investments
3 Months Ended
Sep. 27, 2020
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Investments consist of municipal bonds, corporate bonds, U.S. agency securities, U.S. treasury securities, variable rate demand notes, commercial paper and certificates of deposit. All short-term investments are classified as available-for-sale. Other long-term investments consist of the Company's ownership interest in Lextar.
Short-term investments as of September 27, 2020 and June 28, 2020 consisted of the following:
 September 27, 2020
 Amortized CostGross Unrealized GainsGross Unrealized Losses
Credit Loss Allowance (1)
Estimated Fair Value
Municipal bonds$119.6 $2.3 $— $— $121.9 
Corporate bonds456.3 6.2 — — 462.5 
U.S. agency securities18.2 — (0.1)— 18.1 
U.S. treasury securities58.9 0.5 — — 59.4 
Certificates of deposit33.7 — — — 33.7 
Commercial paper6.5 — — — 6.5 
Total short-term investments$693.2 $9.0 ($0.1)$— $702.1 
 June 28, 2020
 Amortized CostGross Unrealized Gains
Gross Unrealized Losses (2)
Estimated Fair Value
Municipal bonds$130.0 $2.0 $— $132.0 
Corporate bonds473.8 6.3 — 480.1 
U.S. agency securities29.1 — — 29.1 
U.S. treasury securities52.3 0.6 — 52.9 
Certificates of deposit95.3 — — 95.3 
Variable rate demand note2.5 — — 2.5 
Commercial paper11.0 — — 11.0 
Total short-term investments$794.0 $8.9 $— $802.9 
(1) Credit loss allowance is applicable beginning in the first quarter of fiscal 2021 due to adoption of ASU 2016-13, which replaced the Company's other than temporary impairment analysis with an expected credit losses model.
(2) The Company had an unrealized loss of less than $0.1 million as of June 28, 2020.
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 $4.3 million as of September 27, 2020 and June 28, 2020, 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 for each of the three month periods ended September 27, 2020 and September 29, 2019.
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 27, 2020
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Municipal bonds$4.0 $— $— $— $4.0 $— 
Corporate bonds7.8 — — — 7.8 — 
U.S. agency securities16.0 (0.1)— — 16.0 (0.1)
U.S. treasury securities23.8 — — — 23.8 — 
Total$51.6 ($0.1)$— $— $51.6 ($0.1)
Number of securities with an unrealized loss16 — 16 
June 28, 2020
Less than 12 MonthsGreater than 12 MonthsTotal
Fair Value
Unrealized Loss (1)
Fair ValueUnrealized LossFair ValueUnrealized Loss
Municipal bonds$14.3 $— $— $— $14.3 $— 
Corporate bonds29.1 — — — 29.1 — 
U.S. agency securities8.6 — — — 8.6 — 
U.S. treasury securities13.8 — — — 13.8 — 
Total$65.8 $— $— $— $65.8 $— 
Number of securities with an unrealized loss46 — 46 
(1) Securities with an unrealized loss of less than 12 months as of June 28, 2020 have an unrealized loss value of less than $0.1 million, individually and in the aggregate.
The Company utilizes specific identification in computing realized gains and losses on the sale of investments. There were less than $0.1 million of realized losses on the sale of investments for each of the three month periods ended September 27, 2020 and September 29, 2019. Realized losses are included in non-operating expense in the consolidated statements of operations. Unrealized gains and losses are included as a separate component of equity, net of tax, unless the Company evaluates 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 27, 2020 until the investments fully recover in market value. None of the investments with an unrealized loss as of September 27, 2020 had credit downgrades in the current period. No allowance for credit losses was recorded as of September 27, 2020.
The contractual maturities of short-term investments as of September 27, 2020 were as follows:
 
 Within One YearAfter One, Within Five YearsAfter Five, Within Ten YearsAfter Ten YearsTotal
Municipal bonds$24.1 $97.8 $— $— $121.9 
Corporate bonds197.1 265.4 — — 462.5 
U.S. agency securities8.5 9.6 — — 18.1 
U.S. treasury securities44.7 14.7 — — 59.4 
Certificates of deposit33.7 — — — 33.7 
Commercial paper6.5 — — — 6.5 
Total short-term investments$314.6 $387.5 $— $— $702.1