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Marketable Securities (Tables)
 3 Months Ended
Apr. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Investments in Marketable Securities
The following table summarizes our investments in marketable securities at April 30, 2016 and January 30, 2016 (in thousands):
 
April 30, 2016
 
Cost
 
Gross
Unrealized
Holding
Gains
 
Gross
Unrealized
Holding
Losses
 
Fair Value
Commercial paper
$
44,888

 
$
28

 
$
(7
)
 
$
44,909

 
January 30, 2016
 
Cost
 
Gross
Unrealized
Holding
Gains
 
Gross
Unrealized
Holding
Losses
 
Fair Value
Commercial paper
$
49,894

 
$
38

 
$
—

 
$
49,932