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Investments (Tables)
9 Months Ended
Mar. 28, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Short-term Investments by Type
Short-term investments as of March 28, 2021 and June 28, 2020 consisted of the following:
 March 28, 2021
 Amortized CostGross Unrealized Gains
Gross Unrealized Losses (1)
Credit Loss Allowance (2)
Estimated Fair Value
Municipal bonds$135.6 $2.0 $— $— $137.6 
Corporate bonds470.5 3.8 (0.2)— 474.1 
U.S. agency securities15.3 — — — 15.3 
U.S. treasury securities69.4 0.3 — — 69.7 
Certificates of deposit12.8 — — — 12.8 
Variable rate demand note11.0 — — — 11.0 
Commercial paper41.2 — — — 41.2 
Total short-term investments$755.8 $6.1 ($0.2)$— $761.7 
 June 28, 2020
 Amortized CostGross Unrealized Gains
Gross Unrealized Losses (1)
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 deposit83.3 — — 83.3 
Variable rate demand note2.5 — — 2.5 
Commercial paper11.0 — — 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 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.
Schedule of Gross Unrealized Losses and Fair Value of Short-term Investments by Type and Length of Time
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:
March 28, 2021
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Municipal bonds$6.4 $— $— $— $6.4 $— 
Corporate bonds113.4 (0.2)— — 113.4 (0.2)
U.S. agency securities13.2 — — — 13.2 — 
U.S. treasury securities19.4 — — — 19.4 — 
Certificates of deposit0.7 — — — 0.7 — 
Total$153.1 ($0.2)$— $— $153.1 ($0.2)
Number of securities with an unrealized loss104 — 104 
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 for the period as of June 28, 2020 have an unrealized loss value of less than $0.1 million, individually and in the aggregate.
Schedule of Contractual Maturities of Short-term Investments by Type
The contractual maturities of short-term investments as of March 28, 2021 were as follows:
 
 Within One YearAfter One, Within Five YearsAfter Five, Within Ten YearsAfter Ten YearsTotal
Municipal bonds$25.9 $111.7 $— $— $137.6 
Corporate bonds120.5 353.6 — — 474.1 
U.S. agency securities3.0 12.3 — — 15.3 
U.S. treasury securities9.6 60.1 — — 69.7 
Certificates of deposit12.8 — — — 12.8 
Variable rate demand note— — — 11.0 11.0 
Commercial paper41.2 — — — 41.2 
Total short-term investments$213.0 $537.7 $— $11.0 $761.7