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Investments (Tables)
 12 Months Ended
Jun. 25, 2017
Investments, Debt and Equity Securities [Abstract]  
Summary of Short-term Investments by Type
The following table summarizes short-term investments (in thousands): 
 
June 26, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Municipal bonds

$186,893

 

$3,562

 

($15
)
 

$190,440

Corporate bonds
165,766

 
3,074

 
(73
)
 
168,767

Non-U.S. certificates of deposit
73,127

 
—

 
—

 
73,127

U.S. certificates of deposit
3,500

 
—

 
—

 
3,500

Commercial paper
3,317

 
—

 
—

 
3,317

Total short-term investments

$432,603

 

$6,636

 

($88
)
 

$439,151

The following table summarizes short-term investments (in thousands):
 
June 25, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Municipal bonds

$177,890

 

$2,219

 

($68
)
 

$180,041

Corporate bonds
175,991

 
1,925

 
(195
)
 
177,721

Non-U.S. certificates of deposit
120,379

 
—

 
—

 
120,379

U.S. certificates of deposit
—

 
—

 
—

 
—

Commercial paper
200

 
—

 
—

 
200

Total short-term investments

$474,460

 

$4,144

 

($263
)
 

$478,341
Summary 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 (in thousands, except numbers of securities):
 
June 26, 2016
 
Less than 12 Months
 
Greater than 12 Months
 
Total
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
Municipal bonds

$2,936

 

($9
)
 

$3,535

 

($6
)
 

$6,471

 

($15
)
Corporate bonds
27,578

 
(73
)
 
—

 
—

 
27,578

 
(73
)
Total

$30,514

 

($82
)
 

$3,535

 

($6
)
 

$34,049

 

($88
)
Number of securities with an unrealized loss
 
 
22

 
 
 
3

 
 
 
25

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 (in thousands, except numbers of securities): 
 
June 25, 2017
 
Less than 12 Months
 
Greater than 12 Months
 
Total
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
Municipal bonds

$26,816

 

($68
)
 

$—

 

$—

 

$26,816

 

($68
)
Corporate bonds
57,404

 
(195
)
 
—

 
—

 
57,404

 
(195
)
Total

$84,220

 

($263
)
 

$—

 

$—

 

$84,220

 

($263
)
Number of securities with an unrealized loss
 
 
67

 
 
 
—

 
 
 
67
Contractual Maturities of Short-term Investments by Type
The contractual maturities of short-term investments at June 25, 2017 were as follows (in thousands): 
 
Within One
Year
 
After One,
Within Five
Years
 
After Five,
Within Ten
Years
 
After Ten
Years
 
Total
Municipal bonds

$45,519

 

$107,947

 

$26,575

 

$—

 

$180,041

Corporate bonds
48,515

 
94,637

 
34,569

 
—

 
177,721

Non-U.S. certificates of deposit
5,755

 
114,624

 
—

 
—

 
120,379

U.S. certificates of deposit
—

 
—

 
—

 
—

 
—

Commercial paper
200

 
—

 
—

 
—

 
200

Total short-term investments

$99,989

 

$317,208

 

$61,144

 

$—

 

$478,341