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Employee Stock and Savings Plans (Tables)
 6 Months Ended
Jul. 31, 2013
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,
 
2013
 
2012
 
2013
 
2012
Cost of revenues
$
458

 
$
368

 
$
918

 
$
687

Operating expenses:
 
 
 
 
 
 
 
Research and development
2,543

 
2,215

 
5,153

 
4,332

Marketing and selling
1,771

 
1,625

 
3,653

 
3,174

General and administration
2,505

 
2,098

 
4,119

 
3,260

Equity plan-related compensation expense
$
7,277

 
$
6,306

 
$
13,843

 
$
11,453