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Employee Stock and Savings Plans (Tables)
 3 Months Ended
Apr. 30, 2015
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,
 
2015
 
2014
Cost of revenues
$
708

 
$
535

Operating expenses:
 
 
 
Research and development
4,318

 
3,241

Marketing and selling
2,480

 
2,178

General and administration
2,772

 
2,175

Equity plan-related compensation expense
$
10,278

 
$
8,129