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Marketable Securities (Tables)
 12 Months Ended
Apr. 28, 2018
Marketable Securities [Abstract]  
Available-for-sale Securities
As of April 28, 2018 and April 29, 2017, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Balance as of April 28, 2018:
 
 
 
 
 
 
 
Certificates of deposit
$
8,669

 
$
—

 
$
—

 
$
8,669

U.S. Government securities
999

 
—

 
(7
)
 
992

U.S. Government sponsored entities
20,072

 
—

 
(123
)
 
19,949

Municipal bonds
4,936

 
—

 
(24
)
 
4,912

 
$
34,676

 
$
—

 
$
(154
)
 
$
34,522

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
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 28, 2018 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
5,205

 
$
3,464

 
$
8,669

U.S. Government securities
—

 
992

 
992

U.S. Government sponsored entities
11,355

 
8,594

 
19,949

Municipal bonds
3,248

 
1,664

 
4,912

 
$
19,808

 
$
14,714

 
$
34,522