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Marketable Securities (Tables)
 9 Months Ended
Jan. 27, 2018
Marketable Securities [Abstract]  
Available-for-sale Securities
As of January 27, 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 January 27, 2018
 
 
 
 
 
 
 
Certificates of deposit
$
8,918

 
$
—

 
$
—

 
$
8,918

U.S. Government sponsored entities
9,104

 
—

 
(73
)
 
9,031

Municipal bonds
6,001

 
—

 
(13
)
 
5,988

 
$
24,023

 
$
—

 
$
(86
)
 
$
23,937

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 January 27, 2018 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
5,207

 
$
3,711

 
$
8,918

U.S. Government sponsored entities
999

 
8,032

 
9,031

Municipal bonds
2,598

 
3,390

 
5,988

 
$
8,804

 
$
15,133

 
$
23,937