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Employee Stock and Savings Plans (Tables)
 3 Months Ended
Apr. 30, 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 April 30,
 
2014
 
2013
Cost of revenues
$
535

 
$
460

Operating expenses:
 
 
 
Research and development
3,241

 
2,610

Marketing and selling
2,178

 
1,882

General and administration
2,175

 
1,614

Equity plan-related compensation expense
$
8,129

 
$
6,566