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Employee Stock and Savings Plans (Tables)
 9 Months Ended
Oct. 31, 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 October 31,
 
Nine months ended October 31,
 
2015
 
2014
 
2015
 
2014
Cost of revenues
$
665

 
$
608

 
$
1,981

 
$
1,687

Operating expenses:
 
 
 
 
 
 
 
Research and development
4,095

 
3,651

 
12,213

 
10,203

Marketing and selling
2,468

 
2,371

 
7,314

 
6,692

General and administration
2,797

 
2,472

 
9,381

 
7,809

Equity plan-related compensation expense
$
10,025

 
$
9,102

 
$
30,889

 
$
26,391