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Marketable Securities (Tables)
9 Months Ended
Jan. 25, 2014
Marketable Securities [Abstract]  
Available-for-sale Securities
As of January 25, 2014 and April 27, 2013, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Balance as of January 25, 2014:
 
 
 
 
 
 
 
Certificates of deposit
$
7,632

 
$

 
$

 
$
7,632

U.S. Government securities
3,001

 

 

 
3,001

U.S. Government sponsored entities
4,750

 

 

 
4,750

Municipal obligations
9,891

 
16

 

 
9,907

 
$
25,274

 
$
16

 
$

 
$
25,290

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 January 25, 2014 were as follows:
 
Less than 12 months
 
Greater than 12 months
 
Total
Certificates of deposit
$
4,443

 
$
3,189

 
$
7,632

U.S. Government securities
2,001

 
1,000

 
3,001

U.S. Government sponsored entities

 
4,750

 
4,750

Municipal obligations
3,820

 
6,087

 
9,907

 
$
10,264

 
$
15,026

 
$
25,290