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Employee Stock and Savings Plans (Tables)
 6 Months Ended
Jul. 31, 2014
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,
 
2014
 
2013
 
2014
 
2013
Cost of revenues
$
544

 
$
458

 
$
1,079

 
$
918

Operating expenses:
 
 
 
 
 
 
 
Research and development
3,311

 
2,543

 
6,552

 
5,153

Marketing and selling
2,143

 
1,771

 
4,321

 
3,653

General and administration
3,162

 
2,505

 
5,337

 
4,119

Equity plan-related compensation expense
$
9,160

 
$
7,277

 
$
17,289

 
$
13,843