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Marketable Securities (Tables)
 12 Months Ended
Apr. 29, 2017
Marketable Securities [Abstract]  
Available-for-sale Securities
As of April 29, 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 April 29, 2017:
 
 
 
 
 
 
 
Certificates of deposit
$
12,487

 
$
—

 
$
—

 
$
12,487

U.S. Government securities
400

 
—

 
—

 
400

U.S. Government sponsored entities
12,260

 
—

 
(22
)
 
12,238

Municipal bonds
7,574

 
14

 
—

 
7,588

 
$
32,721

 
$
14

 
$
(22
)
 
$
32,713

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
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 29, 2017 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
6,536

 
$
5,951

 
$
12,487

U.S. Government securities
400

 
—

 
400

U.S. Government sponsored entities
5,588

 
6,650

 
12,238

Municipal obligations
2,905

 
4,683

 
7,588

 
$
15,429

 
$
17,284

 
$
32,713