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Marketable Securities (Tables)
 12 Months Ended
Jan. 28, 2017
Marketable Securities [Abstract]  
Summary of Investments in Marketable Securities
The following tables summarize our investments in marketable securities at January 28, 2017 and January 30, 2016:
 
 
January 28, 2017
 
(in thousands)
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Total marketable securities
$
50,460

 
$
3

 
$
(93
)
 
$
50,370

 
 
 
 
 
 
 
 
 
January 30, 2016
 
(in thousands)
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Total marketable securities
$
50,232

 
$
10

 
$
(48
)
 
$
50,194