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Marketable Securities (Tables)
 9 Months Ended
Jan. 31, 2015
Marketable Securities [Abstract]  
Available-for-sale Securities
As of January 31, 2015 and April 26, 2014, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Balance as of January 31, 2015
 
 
 
 
 
 
 
Certificates of deposit
$
9,673

 
$
—

 
$
—

 
$
9,673

U.S. Government securities
1,000

 
1

 
—

 
1,001

U.S. Government sponsored entities
8,650

 
—

 
—

 
8,650

Municipal obligations
6,332

 
6

 
—

 
6,338

 
$
25,655

 
$
7

 
$
—

 
$
25,662

Balance as of April 26, 2014
 

 
 

 
 

 
 

Certificates of deposit
$
7,734

 
$
—

 
$
—

 
$
7,734

U.S. Government securities
2,000

 
2

 
—

 
2,002

U.S. Government sponsored entities
8,349

 
—

 
(8
)
 
8,341

Municipal obligations
7,309

 
12

 
—

 
7,321

 
$
25,392

 
$
14

 
$
(8
)
 
$
25,398
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 31, 2015 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
3,212

 
$
6,461

 
$
9,673

U.S. Government securities
1,001

 
—

 
1,001

U.S. Government sponsored agencies
—

 
8,650

 
8,650

Municipal obligations
5,363

 
975

 
6,338

 
$
9,576

 
$
16,086

 
$
25,662