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Marketable Securities (Tables)
 12 Months Ended
Apr. 30, 2016
Marketable Securities [Abstract]  
Available-for-sale Securities
As of April 30, 2016 and May 2, 2015, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Balance as of April 30, 2016:
 
 
 
 
 
 
 
Certificates of deposit
$
14,927

 
$
—

 
$
—

 
$
14,927

U.S. Government sponsored entities
8,523

 
—

 
(1
)
 
8,522

Municipal bonds
1,221

 
2

 
—

 
1,223

 
$
24,671

 
$
2

 
$
(1
)
 
$
24,672

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 bonds
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 April 30, 2016 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
7,650

 
$
7,277

 
$
14,927

U.S. Government sponsored entities
—

 
8,522

 
8,522

Municipal obligations
—

 
1,223

 
1,223

 
$
7,650

 
$
17,022

 
$
24,672