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Employee Stock and Savings Plans (Tables)
 9 Months Ended
Oct. 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 October 31,
 
Nine months ended October 31,
 
2014
 
2013
 
2014
 
2013
Cost of revenues
$
608

 
$
520

 
$
1,687

 
$
1,438

Operating expenses:
 
 
 
 
 
 
 
Research and development
3,651

 
2,865

 
10,203

 
8,018

Marketing and selling
2,371

 
1,998

 
6,692

 
5,651

General and administration
2,472

 
2,043

 
7,809

 
6,162

Equity plan-related compensation expense
$
9,102

 
$
7,426

 
$
26,391

 
$
21,269