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Marketable Securities (Tables)
 6 Months Ended
Oct. 31, 2015
Marketable Securities [Abstract]  
Available-for-sale Securities
As of October 31, 2015 and May 2, 2015, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Balance as of October 31, 2015
 
 
 
 
 
 
 
Certificates of deposit
$
14,925

 
$
—

 
$
—

 
$
14,925

U.S. Government securities
500

 
—

 
—

 
500

U.S. Government sponsored entities
6,577

 
—

 
(4
)
 
6,573

Municipal obligations
2,936

 
1

 
—

 
2,937

 
$
24,938

 
$
1

 
$
(4
)
 
$
24,935

Balance as of May 2, 2015
 

 
 

 
 

 
 

Certificates of deposit
$
11,409

 
$
—

 
$
—

 
$
11,409

U.S. Government securities
1,000

 
1

 
—

 
1,001

U.S. Government sponsored entities
7,951

 
—

 
(9
)
 
7,942

Municipal obligations
4,989

 
5

 
—

 
4,994

 
$
25,349

 
$
6

 
$
(9
)
 
$
25,346
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 31, 2015 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
5,084

 
$
9,841

 
$
14,925

U.S. Government securities
500

 
—

 
500

U.S. Government sponsored agencies
—

 
6,573

 
6,573

Municipal obligations
2,489

 
448

 
2,937

 
$
8,073

 
$
16,862

 
$
24,935