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Investments (Tables)
 9 Months Ended
Oct. 29, 2016
Investments [Abstract]  
Investments
The following table discloses the major categories of the Company's investments as of the dates presented:
 
Short-term investments
 
Long-term investments
 
October 29, 2016
 
January 30, 2016
 
October 31, 2015
 
October 29, 2016
 
January 30, 2016
 
October 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
(in thousands)
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
 
 
Carrying value
$
78,497

 
$
225,985

 
$
—

 
$
76,206

 
$
72,153

 
$
306,792

Unrealized gains included in accumulated other comprehensive loss
156

 
477

 
—

 
29

 
22

 
207

Unrealized losses included in accumulated other comprehensive loss
(141
)
 
(435
)
 
—

 
(109
)
 
(222
)
 
(516
)
Total investments
$
78,512

 
$
226,027

 
$
—

 
$
76,126

 
$
71,953

 
$
306,483