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Investments | 6 Months Ended
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Dec. 27, 2020
Investments, Debt and Equity Securities [Abstract] |
Investments | InvestmentsInvestments 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 December 27, 2020 and June 28, 2020 consisted of the following:
|  | December 27, 2020
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses (1) |  | Credit Loss Allowance (2) |  | Estimated Fair Value
Municipal bonds |  | $126.5 |  |  | $2.3 |  |  | $— |  |  | $— |  |  | $128.8 |
Corporate bonds |  | 398.9 |  |  | 5.7 |  |  | — |  |  | — |  |  | 404.6 |
U.S. agency securities |  | 12.0 |  |  | — |  |  | — |  |  | — |  |  | 12.0 |
U.S. treasury securities |  | 23.3 |  |  | 0.4 |  |  | — |  |  | — |  |  | 23.7 |
Certificates of deposit |  | 7.7 |  |  | — |  |  | — |  |  | — |  |  | 7.7 |
Variable rate demand note |  | 2.1 |  |  | — |  |  | — |  |  | — |  |  | 2.1 |
Commercial paper |  | 1.7 |  |  | — |  |  | — |  |  | — |  |  | 1.7 |
Total short-term investments |  | $572.2 |  |  | $8.4 |  |  | $— |  |  | $— |  |  | $580.6 |
|  |  |  | June 28, 2020
|  |  |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses (1) |  | Estimated Fair Value
Municipal bonds |  |  |  | $130.0 |  |  | $2.0 |  |  | $— |  |  | $132.0 |
Corporate bonds |  |  |  | 473.8 |  |  | 6.3 |  |  | — |  |  | 480.1 |
U.S. agency securities |  |  |  | 29.1 |  |  | — |  |  | — |  |  | 29.1 |
U.S. treasury securities |  |  |  | 52.3 |  |  | 0.6 |  |  | — |  |  | 52.9 |
Certificates of deposit |  |  |  | 83.3 |  |  | — |  |  | — |  |  | 83.3 |
Variable rate demand note |  |  |  | 2.5 |  |  | — |  |  | — |  |  | 2.5 |
Commercial paper |  |  |  | 11.0 |  |  | — |  |  | — |  |  | 11.0 |
Total short-term investments |  |  |  | $782.0 |  |  | $8.9 |  |  | $— |  |  | $790.9 |
(1) The Company had an unrealized loss of less than $0.1 million as of December 27, 2020 and June 28, 2020. (2) 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. 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 $3.8 million and $4.3 million as of December 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 and six month periods ended December 27, 2020 and December 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:
|  | December 27, 2020
|  | Less than 12 Months |  | Greater than 12 Months |  | Total
|  | Fair Value |  | Unrealized Loss (1) |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
Municipal bonds |  | $1.0 |  |  | $— |  |  | $— |  |  | $— |  |  | $1.0 |  |  | $— |
Corporate bonds |  | 7.0 |  |  | — |  |  | — |  |  | — |  |  | 7.0 |  |  | — |
U.S. agency securities |  | 2.0 |  |  | — |  |  | — |  |  | — |  |  | 2.0 |  |  | — |
U.S. treasury securities |  | 2.0 |  |  | — |  |  | — |  |  | — |  |  | 2.0 |  |  | — |
Total |  | $12.0 |  |  | $— |  |  | $— |  |  | $— |  |  | $12.0 |  |  | $— |
Number of securities with an unrealized loss |  |  |  | 10 |  |  |  |  | — |  |  |  |  | 10 |
|  | June 28, 2020
|  | Less than 12 Months |  | Greater than 12 Months |  | Total
|  | Fair Value |  | Unrealized Loss (1) |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
Municipal bonds |  | $14.3 |  |  | $— |  |  | $— |  |  | $— |  |  | $14.3 |  |  | $— |
Corporate bonds |  | 29.1 |  |  | — |  |  | — |  |  | — |  |  | 29.1 |  |  | — |
U.S. agency securities |  | 8.6 |  |  | — |  |  | — |  |  | — |  |  | 8.6 |  |  | — |
U.S. treasury securities |  | 13.8 |  |  | — |  |  | — |  |  | — |  |  | 13.8 |  |  | — |
Total |  | $65.8 |  |  | $— |  |  | $— |  |  | $— |  |  | $65.8 |  |  | $— |
Number of securities with an unrealized loss |  |  |  | 46 |  |  |  |  | — |  |  |  |  | 46 |
(1) S ecurities with an unrealized loss of less than 12 months for the periods as of December 27, 2020 and 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. Realized gains of $0.2 million for the three and six months ended December 27, 2020 and $0.1 million for the three and six months ended December 29, 2019 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 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 27, 2020 until the investments fully recover in market value. None of the investments with an unrealized loss as of December 27, 2020 had credit downgrades in the current period. No allowance for credit losses was recorded as of December 27, 2020. The contractual maturities of short-term investments as of December 27, 2020 were as follows:
|  | Within One Year |  | After One, Within Five Years |  | After Five, Within Ten Years |  | After Ten Years |  | Total
Municipal bonds |  | $23.7 |  |  | $105.1 |  |  | $— |  |  | $— |  |  | $128.8 |
Corporate bonds |  | 156.6 |  |  | 248.0 |  |  | — |  |  | — |  |  | 404.6 |
U.S. agency securities |  | 3.0 |  |  | 9.0 |  |  | — |  |  | — |  |  | 12.0 |
U.S. treasury securities |  | 10.6 |  |  | 13.1 |  |  | — |  |  | — |  |  | 23.7 |
Certificates of deposit |  | 7.7 |  |  | — |  |  | — |  |  | — |  |  | 7.7 |
Variable rate demand note |  | — |  |  | — |  |  | — |  |  | 2.1 |  |  | 2.1 |
Commercial paper |  | 1.7 |  |  | — |  |  | — |  |  | — |  |  | 1.7 |
Total short-term investments |  | $203.3 |  |  | $375.2 |  |  | $— |  |  | $2.1 |  |  | $580.6 |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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