Investments (Tables)

12 Months Ended

Jun. 28, 2020

Investments, Debt and Equity Securities [Abstract]

Schedule of Short-term Investments by Type

Short-term investments as of June 28, 2020 consist of the following:

	June 28, 2020
(in millions of U.S. Dollars)	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
U.S. certificates of deposit	95.3	—	—	95.3
Commercial paper	11.0	—	—	11.0
Variable rate demand note	2.5	—	—	2.5
Total short-term investments	$794.0	$8.9	$—	$802.9

⁽¹⁾ The Company had an unrealized loss of less than $0.1 million as of June 28, 2020.

Short-term investments as of June 30, 2019 consist of the following: 

	June 30, 2019
(in millions of U.S. Dollars)	Amortized Cost	Gross Unrealized Gains	Gross Unrealized Losses	Estimated Fair Value
Municipal bonds	$78.2	0.4	($0.1)	$78.5
Corporate bonds	256.0	1.0	—	257.0
U.S. agency securities	25.6	—	—	25.6
U.S. treasury securities	92.4	0.1		92.5
Certificates of deposit	71.5	1.1	—	72.6
Commercial paper	7.8	—	—	7.8
Variable rate demand note	16.9	—	—	16.9
Total short-term investments	$548.4	2.6	($0.1)	$550.9

Schedule of Gross Unrealized Losses and Fair Value of Short-term Investments by Type and Length of Time

The following table presents 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:

	June 28, 2020
	Less than 12 Months		Greater than 12 Months		Total
(in millions of U.S. Dollars)	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⁾ 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 following table presents 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:

	June 30, 2019
	Less than 12 Months		Greater than 12 Months		Total
(in millions of U.S. Dollars)	Fair Value	Unrealized Loss (1)	Fair Value	Unrealized Loss	Fair Value	Unrealized Loss
Municipal bonds	$4.3	$—	$29.8	($0.1)	$34.1	($0.1)
Corporate bonds	41.8	—	14.7	—	56.5	—
U.S. agency securities	7.7	—	—	—	7.7	—
U.S. treasury securities	2.0	—	3.9	—	5.9	—
Total	$55.8	$—	$48.4	($0.1)	$104.2	($0.1)
Number of securities with an unrealized loss		46		47		93

⁽¹⁾ Securities with an unrealized loss of less than 12 months as of June 30, 2019 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 at June 28, 2020 were as follows:

(in millions of U.S. Dollars)	Within One Year	After One, Within Five Years	After Five, Within Ten Years	After Ten Years	Total
Municipal bonds	$29.4	$102.6	$—	$—	$132.0
Corporate bonds	191.0	289.1	—	—	480.1
U.S. agency securities	17.3	11.8	—	—	29.1
U.S. treasury securities	36.1	16.8	—	—	52.9
Certificates of deposit	95.3	—	—	—	95.3
Commercial paper	11.0	—	—	—	11.0
Variable rate demand note	—	—	—	2.5	2.5
Total short-term investments	$380.1	$420.3	$—	$2.5	$802.9