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Investments (Tables)
 12 Months Ended
Jun. 26, 2016
Investments, Debt and Equity Securities [Abstract]  
Summary of Short-term Investments by Type
The following table summarizes short-term investments (in thousands): 
 
June 28, 2015
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Municipal bonds

$194,123

 

$988

 

($341
)
 

$194,770

Corporate bonds
152,831

 
832

 
(158
)
 
153,505

Non-U.S. certificates of deposit
225,206

 
—

 
—

 
225,206

Total short-term investments

$572,160

 

$1,820

 

($499
)
 

$573,481

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
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 28, 2015
 
Less than 12 Months
 
Greater than 12 Months
 
Total
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
Municipal bonds

$53,204

 

($341
)
 

$—

 

$—

 

$53,204

 

($341
)
Corporate bonds
46,636

 
(143
)
 
1,812

 
(15
)
 
48,448

 
(158
)
Total

$99,840

 

($484
)
 

$1,812

 

($15
)
 

$101,652

 

($499
)
Number of securities with an unrealized loss
 
 
54

 
 
 
1

 
 
 
55

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
Contractual Maturities of Short-term Investments by Type
The contractual maturities of short-term investments at June 26, 2016 were as follows (in thousands): 
 
Within One
Year
 
After One,
Within Five
Years
 
After Five,
Within Ten
Years
 
After Ten
Years
 
Total
Municipal bonds

$31,874

 

$124,745

 

$33,821

 

$—

 

$190,440

Corporate bonds
14,672

 
116,541

 
37,554

 
—

 
168,767

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

 
—

 
—

 
—

 
73,127

U.S. certificates of deposit
500

 
3,000

 
—

 
—

 
3,500

Commercial paper
3,317

 
—

 
—

 
—

 
3,317

Total short-term investments

$123,490

 

$244,286

 

$71,375

 

$—

 

$439,151