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Investments (Tables)
 12 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of Short-term Investments by Type
Short-term investments as of June 24, 2018 consist of the following: 
 
June 24, 2018
(in millions of U.S. Dollars)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Municipal bonds

$110.2

 
—

 

($0.9
)
 

$109.3

Corporate bonds
77.9

 
—

 
(1.1
)
 
76.8

U.S. agency securities
3.9

 
—

 
—

 
3.9

U.S. certificates of deposit
0.5

 
—

 
—

 
0.5

Non-U.S. certificates of deposit
77.7

 
—

 
—

 
77.7

Total short-term investments

$270.2

 
—

 

($2.0
)
 

$268.2


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

U.S. certificates of deposit
22.4

 
—

 
—

 
22.4

Non-U.S. certificates of deposit
49.1

 
1.1

 
—

 
50.2

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 24, 2018
 
Less than 12 Months
 
Greater than 12 Months
 
Total
(in millions of U.S. Dollars)
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
Municipal bonds

$97.5

 

($0.9
)
 

$3.6

 

$—

 

$101.1

 

($0.9
)
Corporate bonds
61.5

 
(1.1
)
 
1.5

 
—

 
63.0

 
(1.1
)
U.S. agency securities
3.9

 
—

 
—

 
—

 
3.9

 
—

Total

$162.9

 

($2.0
)
 

$5.1

 

$—

 

$168.0

 

($2.0
)
Number of securities with an unrealized loss
 
 
151

 
 
 
6

 
 
 
157


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
 
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
Schedule of Contractual Maturities of Short-term Investments by Type
The contractual maturities of short-term investments at June 30, 2019 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

$22.0

 

$56.5

 

$—

 

$—

 

$78.5

Corporate bonds
149.6

 
107.4

 
—

 
—

 
257.0

U.S. agency securities
17.1

 
8.5

 
—

 
—

 
25.6

U.S. treasury securities
92.5

 
—

 
—

 
—

 
92.5

U.S. certificates of deposit
22.4

 
—

 
—

 
—

 
22.4

Non-U.S. certificates of deposit
50.2

 
—

 
—

 
—

 
50.2

Commercial paper
7.8

 
—

 
—

 
—

 
7.8

Variable rate demand note
—

 
5.0

 
—

 
11.9

 
16.9

Total short-term investments

$361.6

 

$177.4

 

$—

 

$11.9

 

$550.9