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Marketable Securities (Tables)
 9 Months Ended
Jan. 28, 2017
Marketable Securities [Abstract]  
Available-for-sale Securities
As of January 28, 2017 and April 30, 2016, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Balance as of January 28, 2017
 
 
 
 
 
 
 
Certificates of deposit
$
13,076

 
$
—

 
$
—

 
$
13,076

U.S. Government securities
400

 
—

 
—

 
400

U.S. Government sponsored entities
7,666

 
—

 
(22
)
 
7,644

Municipal obligations
6,915

 
—

 
(1
)
 
6,914

 
$
28,057

 
$
—

 
$
(23
)
 
$
28,034

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 January 28, 2017 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
6,626

 
$
6,450

 
$
13,076

U.S. Government securities
400

 
—

 
400

U.S. Government sponsored agencies
—

 
7,643

 
7,643

Municipal obligations
1,453

 
5,462

 
6,915

 
$
8,479

 
$
19,555

 
$
28,034