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Marketable Securities (Tables)
 6 Months Ended
Oct. 29, 2016
Marketable Securities [Abstract]  
Available-for-sale Securities
As of October 29, 2016 and April 30, 2016, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Balance as of October 29, 2016
 
 
 
 
 
 
 
Certificates of deposit
$
13,804

 
$
—

 
$
—

 
$
13,804

U.S. Government securities
401

 
—

 
—

 
401

U.S. Government sponsored entities
2,201

 
—

 
(2
)
 
2,199

Municipal obligations
1,500

 
—

 
—

 
1,500

 
$
17,906

 
$
—

 
$
(2
)
 
$
17,904

Balance as of April 30, 2016
 

 
 

 
 

 
 

Certificates of deposit
$
14,927

 
$
—

 
$
—

 
$
14,927

U.S. Government sponsored entities
8,523

 
—

 
(1
)
 
8,522

Municipal obligations
1,221

 
2

 
—

 
1,223

 
$
24,671

 
$
2

 
$
(1
)
 
$
24,672
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 October 29, 2016 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
7,113

 
$
6,691

 
$
13,804

U.S. Government securities
401

 
—

 
401

U.S. Government sponsored agencies
800

 
1,398

 
2,198

Municipal obligations
1,205

 
296

 
1,501

 
$
9,519

 
$
8,385

 
$
17,904