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Employee Stock and Savings Plans (Tables)
 9 Months Ended
Oct. 31, 2012
Notes To Financial Statements [Abstract]  
Stock Compensation Expense Recognized
The following table summarizes stock compensation expense recognized:
 
 
Three months ended October 31,
 
Nine months ended October 31,
 
2012
 
2011
 
2012
 
2011
Cost of revenues
$
393

 
$
249

 
$
1,080

 
$
753

Operating expenses:
 
 
 
 
 
 
 
Research and development
2,272

 
2,005

 
6,604

 
6,119

Marketing and selling
1,644

 
1,365

 
4,818

 
4,393

General and administration
1,400

 
1,495

 
4,660

 
5,358

Equity plan-related compensation expense
$
5,709

 
$
5,114

 
$
17,162

 
$
16,623