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Investments (Tables)
 9 Months Ended
Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Investments by Type
The following tables provide a summary of marketable investments by type (in thousands):
 
 
March 31, 2013
 
 
Amortized    
Cost
 
Gross Unrealized    
Gains
 
Gross
Unrealized    
Losses
 
 Estimated Fair 
Value
Municipal bonds
 
$
246,957

 
$
1,496

 
$
(61
)
 
$
248,392

Corporate bonds
 
176,963

 
2,468

 
(101
)
 
179,330

Certificates of deposit
 
265,000

 
—

 
—

 
265,000

U.S. agency securities
 
56,391

 
333

 
(1
)
 
56,723

Non-U.S. government securities
 
9,139

 
29

 
—

 
9,168

Total
 
$
754,450

 
$
4,326

 
$
(163
)
 
$
758,613

 
 
 
 
 
 
 
 
 
 
 
June 24, 2012
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated Fair
Value
Municipal bonds
 
$
209,626

 
$
2,036

 
$
(58
)
 
$
211,604

Corporate bonds
 
144,942

 
1,848

 
(123
)
 
146,667

Certificates of deposit
 
130,000

 
—

 
—

 
130,000

U.S. agency securities
 
68,156

 
450

 
(7
)
 
68,599

Non-U.S. government securities
 
8,746

 
15

 
(3
)
 
8,758

Total
 
$
561,470

 
$
4,349

 
$
(191
)
 
$
565,628
Schedule of Unrealized Loss on Investments
The following tables present the gross unrealized losses and estimated fair value of the Company's investment securities, aggregated by investment type and length of time that individual investments securities have been in a continuous unrealized loss position (in thousands):
 
 
March 31, 2013
 
 
Less than 12 Months
 
Greater than 12 Months
 
Total
 
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
Municipal bonds
 
$
25,869

 
$
(61
)
 
$
—

 
$
—

 
$
25,869

 
$
(61
)
Corporate bonds
 
37,174

 
(101
)
 
—

 
—

 
37,174

 
(101
)
U.S. agency securities
 
2,002

 
(1
)
 
—

 
—

 
2,002

 
(1
)
Total
 
$
65,045

 
$
(163
)
 
$
—

 
$
—

 
$
65,045

 
$
(163
)
Number of securities with an unrealized loss
 
 
 
33

 
 
 
—

 
 
 
33

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
June 24, 2012
 
 
Less than 12 Months
 
Greater than 12 Months
 
Total
 
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
Municipal bonds
 
$
30,102

 
$
(58
)
 
$
—

 
$
—

 
$
30,102

 
$
(58
)
Corporate bonds
 
30,550

 
(123
)
 
—

 
—

 
30,550

 
(123
)
U.S. agency securities
 
3,014

 
(7
)
 
—

 
—

 
3,014

 
(7
)
Non-U.S. government securities
 
1,543

 
(3
)
 
—

 
—

 
1,543

 
(3
)
Total
 
$
65,209

 
$
(191
)
 
$
—

 
$
—

 
$
65,209

 
$
(191
)
Number of securities with an unrealized loss
 
 
 
33

 
 
 
—

 
 
 
33
Contractual Maturities of Marketable Investments
The contractual maturities of marketable investments at March 31, 2013 were as follows (in thousands):
 
 
March 31, 2013
 
Within One    
Year
 
After One,
Within Five    
Years
 
After Five,
Within Ten    
Years
 
After Ten    
Years
 
Total
Municipal bonds
$
59,355

 
$
189,037

 
$
—

 
$
—

 
$
248,392

Corporate bonds
25,404

 
151,426

 
2,500

 
—

 
179,330

Certificates of deposit
265,000

 
—

 
—

 
—

 
265,000

U.S. agency securities
20,145

 
36,578

 
—

 
—

 
56,723

Non-U.S. government securities
3,012

 
6,156

 
—

 
—

 
9,168

Total
$
372,916

 
$
383,197

 
$
2,500

 
$
—

 
$
758,613