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Marketable Securities (Tables)
 12 Months Ended
Apr. 27, 2013
Marketable Securities [Abstract]  
Available-for-sale Securities
As of April 27, 2013 and April 28, 2012, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
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

Balance as of April 28, 2012:
 

 
 

 
 

 
 

Certificates of deposit
$
7,657

 
$
—

 
$
—

 
$
7,657

U.S. Government securities
7,507

 
49

 
—

 
7,556

U.S. Government sponsored entities
4,503

 
2

 
—

 
4,505

Municipal obligations
5,517

 
23

 
—

 
5,540

 
$
25,184

 
$
74

 
$
—

 
$
25,258
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 April 27, 2013 were as follows:
 
Less than 12 months
 
Greater than 12 months
 
Total
Certificates of deposit
$
1,473

 
$
3,204

 
$
4,677

U.S. Government securities
3,017

 
2,001

 
5,018

U.S. Government sponsored entities
—

 
4,752

 
4,752

Municipal obligations
3,863

 
5,742

 
9,605

 
$
8,353

 
$
15,699

 
$
24,052