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Marketable Securities (Tables)
 6 Months Ended
Oct. 27, 2018
Marketable Securities [Abstract]  
Available-for-sale Securities
As of October 27, 2018 and April 28, 2018, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Losses
 
Fair Value
Balance as of October 27, 2018
 
 
 
 
 
Certificates of deposit
$
5,196

 
$
—

 
$
5,196

U.S. Government securities
7,240

 
(9
)
 
7,231

U.S. Government sponsored entities
16,090

 
(104
)
 
15,986

Municipal bonds
3,322

 
(14
)
 
3,308

 
$
31,848

 
$
(127
)
 
$
31,721

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 October 27, 2018 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
2,479

 
$
2,717

 
$
5,196

U.S. Government securities
6,240

 
991

 
7,231

U.S. Government sponsored entities
11,157

 
4,829

 
15,986

Municipal bonds
2,961

 
347

 
3,308

 
$
22,837

 
$
8,884

 
$
31,721