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Employee Stock and Savings Plans (Tables)
 9 Months Ended
Oct. 31, 2016
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,
 
2016
 
2015
 
2016
 
2015
Cost of revenues
$
785

 
$
665

 
$
2,277

 
$
1,981

Operating expenses:
 
 
 
 
 
 
 
Research and development
4,708

 
4,095

 
13,598

 
12,213

Marketing and selling
2,911

 
2,468

 
8,612

 
7,314

General and administration
2,687

 
2,797

 
9,031

 
9,381

Equity plan-related compensation expense
$
11,091

 
$
10,025

 
$
33,518

 
$
30,889