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Investments (Tables)
 3 Months Ended
Apr. 30, 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
 
April 30, 2016
 
January 30, 2016
 
May 2, 2015
 
April 30, 2016
 
January 30, 2016
 
May 2, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
(in thousands)
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
 
 
Carrying value
$
97,236

 
$
225,985

 
$
128,779

 
$
80,748

 
$
72,153

 
$
121,011

 
 
 
 
 
 
 
 
 
 
 
 
Unrealized gains included in accumulated other comprehensive loss
411

 
477

 
38

 
22

 
22

 
38

Unrealized losses included in accumulated other comprehensive loss
(35
)
 
(435
)
 
(112
)
 
(314
)
 
(222
)
 
(325
)
 
 
 
 
 
 
 
 
 
 
 
 
Total investments
$
97,612

 
$
226,027

 
$
128,705

 
$
80,456

 
$
71,953

 
$
120,724