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Employee Stock and Savings Plans (Tables)
 9 Months Ended
Oct. 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 October 31,
 
Nine months ended October 31,
 
2013
 
2012
 
2013
 
2012
Cost of revenues
$
520

 
$
393

 
$
1,438

 
$
1,080

Operating expenses:
 
 
 
 
 
 
 
Research and development
2,865

 
2,272

 
8,018

 
6,604

Marketing and selling
1,998

 
1,644

 
5,651

 
4,818

General and administration
2,043

 
1,400

 
6,162

 
4,660

Equity plan-related compensation expense
$
7,426

 
$
5,709

 
$
21,269

 
$
17,162