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Marketable Securities (Tables)
 3 Months Ended
Jul. 27, 2013
Marketable Securities [Abstract]  
Available-for-sale Securities
As of July 27, 2013 and April 27, 2013, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Balance as of July 27, 2013:
 
 
 
 
 
 
 
Certificates of deposit
$
4,677

 
$
—

 
$
—

 
$
4,677

U.S. Government securities
5,000

 
10

 
—

 
5,010

U.S. Government sponsored entities
4,251

 
—

 
(2
)
 
4,249

Municipal obligations
10,706

 
—

 
(6
)
 
10,700

 
$
24,634

 
$
10

 
$
(8
)
 
$
24,636

Balance as of April 27, 2013:
 

 
 

 
 

 
 

Certificates of deposit
$
4,677

 
$
—

 
$
—

 
$
4,677

U.S. Government securities
4,999

 
19

 
—

 
5,018

U.S. Government sponsored entities
4,752

 
—

 
—

 
4,752

Municipal obligations
9,596

 
9

 
—

 
9,605

 
$
24,024

 
$
28

 
$
—

 
$
24,052
Investments Classified by Contractual Maturity Date
All available-for-sale securities are classified as current assets, as they are readily available to support our current operating needs. The contractual maturities of available-for-sale debt securities as of July 27, 2013 were as follows:
 
Less than 12 months
 
Greater than 12 months
 
Total
Certificates of deposit
$
1,718

 
$
2,959

 
$
4,677

U.S. Government securities
3,011

 
1,999

 
5,010

U.S. Government sponsored entities
—

 
4,249

 
4,249

Municipal obligations
4,141

 
6,559

 
10,700

 
$
8,870

 
$
15,766

 
$
24,636