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Marketable Securities (Tables)
12 Months Ended
Jan. 30, 2016
Marketable Securities [Abstract]  
Summary of Investments in Marketable Securities
The following tables summarize our investments in marketable securities at January 30, 2016 and January 31, 2015:
 
 
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

 
 
 
 
 
 
 
 
 
January 31, 2015
 
(in thousands)
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Total marketable securities
$
126,566

 
$
38

 
$
(43
)
 
$
126,561