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Marketable Securities (Tables)
9 Months Ended
Jan. 26, 2013
Marketable Securities [Abstract]  
Available-for-sale Securities
As of January 26, 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 January 26, 2013:
 
 
 
 
 
 
 
Certificates of deposit
$
7,155

 
$
2

 
$

 
$
7,157

U.S. Government securities
5,998

 
20

 

 
6,018

U.S. Government sponsored entities
4,753

 

 
(7
)
 
4,746

Municipal obligations
7,606

 
12

 

 
7,618

 
$
25,512

 
$
34

 
$
(7
)
 
$
25,539

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 January 26, 2013 were as follows:
 
Less than 12 months
 
Greater than 12 months
 
Total
Certificates of deposit
$
4,199

 
$
2,958

 
$
7,157

U.S. Government securities
3,011

 
3,007

 
6,018

U.S. Government sponsored entities

 
4,746

 
4,746

Municipal obligations
2,542

 
5,076

 
7,618

 
$
9,752

 
$
15,787

 
$
25,539