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Employee Stock and Savings Plans (Tables)
 6 Months Ended
Jul. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock compensation expense recognized
The following table summarizes stock-based compensation expense recognized:
 
Three months ended July 31,
 
Six months ended July 31,
 
2016
 
2015
 
2016
 
2015
Cost of revenues
$
781

 
$
608

 
$
1,492

 
$
1,316

Operating expenses:
 
 
 
 
 
 
 
Research and development
4,567

 
3,800

 
8,890

 
8,118

Marketing and selling
2,846

 
2,366

 
5,701

 
4,846

General and administration
3,732

 
3,812

 
6,344

 
6,584

Equity plan-related compensation expense
$
11,926

 
$
10,586

 
$
22,427

 
$
20,864