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Marketable Securities (Tables)
 3 Months Ended
Aug. 03, 2019
Marketable Securities [Abstract]  
Available-for-sale Securities
As of August 3, 2019 and April 27, 2019, our available-for-sale securities consisted of the following:
 
Amortized Cost
 
Unrealized Losses
 
Fair Value
Balance as of August 3, 2019
 
 
 
 
 
Certificates of deposit
$
3,464

 
$
—

 
$
3,464

U.S. Government securities
1,000

 
—

 
1,000

U.S. Government sponsored entities
5,913

 
(2
)
 
5,911

Municipal bonds
1,503

 
—

 
1,503

 
$
11,880

 
$
(2
)
 
$
11,878

Balance as of April 27, 2019
 

 
 

 
 

Certificates of deposit
$
3,464

 
$
—

 
$
3,464

U.S. Government securities
10,779

 
(5
)
 
10,774

U.S. Government sponsored entities
10,510

 
(28
)
 
10,482

Municipal bonds
1,626

 
(2
)
 
1,624

 
$
26,379

 
$
(35
)
 
$
26,344
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 August 3, 2019 were as follows:
 
Less than 12 months
 
1-5 Years
 
Total
Certificates of deposit
$
2,234

 
$
1,230

 
$
3,464

U.S. Government securities
1,000

 
—

 
1,000

U.S. Government sponsored entities
3,661

 
2,250

 
5,911

Municipal bonds
1,503

 
—

 
1,503

 
$
8,398

 
$
3,480

 
$
11,878