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Marketable Securities (Tables)
 3 Months Ended
Jul. 28, 2012
Marketable Securities [Abstract]  
Available-for-sale Securities
As of July 28, 2012 and April 28, 2012, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Balance as of July 28, 2012:
 
 
 
 
 
 
 
Certificates of deposit
$
7,162

 
$
2

 
$
—

 
$
7,164

U.S. Government securities
6,500

 
39

 
—

 
6,539

U.S. Government sponsored entities
5,202

 
1

 
—

 
5,203

Municipal obligations
6,124

 
20

 
—

 
6,144

 
$
24,988

 
$
62

 
$
—

 
$
25,050

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 July 28, 2012 were as follows:
 
Less than 12 months
 
Greater than 12 months
 
Total
Certificates of deposit
$
5,187

 
$
1,977

 
$
7,164

U.S. Government securities
3,510

 
3,029

 
6,539

U.S. Government sponsored agencies
—

 
5,203

 
5,203

Municipal obligations
1,587

 
4,557

 
6,144

 
$
10,284

 
$
14,766

 
$
25,050