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Marketable Securities (Tables)
 3 Months Ended
Jul. 28, 2018
Marketable Securities [Abstract]  
Available-for-sale Securities
As of July 28, 2018 and April 28, 2018, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Losses
 
Fair Value
Balance as of July 28, 2018
 
 
 
 
 
Certificates of deposit
$
6,189

 
$
—

 
$
6,189

U.S. Government securities
1,994

 
(8
)
 
1,986

U.S. Government sponsored entities
15,089

 
(118
)
 
14,971

Municipal bonds
4,213

 
(7
)
 
4,206

 
$
27,485

 
$
(133
)
 
$
27,352

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 July 28, 2018 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
2,725

 
$
3,464

 
$
6,189

U.S. Government securities
995

 
991

 
1,986

U.S. Government sponsored entities
8,350

 
6,621

 
14,971

Municipal bonds
2,660

 
1,546

 
4,206

 
$
14,730

 
$
12,622

 
$
27,352