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Marketable Securities (Tables)
 9 Months Ended
Jan. 26, 2019
Marketable Securities [Abstract]  
Available-for-sale Securities
As of January 26, 2019 and April 28, 2018, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Losses
 
Fair Value
Balance as of January 26, 2019
 
 
 
 
 
Certificates of deposit
$
3,959

 
$
—

 
$
3,959

U.S. Government securities
15,493

 
(11
)
 
15,482

U.S. Government sponsored entities
14,929

 
(65
)
 
14,864

Municipal bonds
3,297

 
(6
)
 
3,291

 
$
37,678

 
$
(82
)
 
$
37,596

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
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 26, 2019 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
1,985

 
$
1,974

 
$
3,959

U.S. Government securities
14,488

 
994

 
15,482

U.S. Government sponsored entities
11,646

 
3,218

 
14,864

Municipal bonds
3,134

 
157

 
3,291

 
$
31,253

 
$
6,343

 
$
37,596