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Employee Stock and Savings Plans (Tables)
 6 Months Ended
Jul. 31, 2012
Notes To Financial Statements [Abstract]  
Stock Compensation Expense Recognized
The following table summarizes stock compensation expense recognized:
 
 
Three months ended July 31,
 
Six months ended July 31,
 
2012
 
2011
 
2012
 
2011
Cost of revenues
$
368

 
$
237

 
$
687

 
$
504

Operating expenses:
 
 
 
 
 
 
 
Research and development
2,215

 
1,975

 
4,332

 
4,114

Marketing and selling
1,625

 
1,413

 
3,174

 
3,028

General and administration
2,098

 
2,204

 
3,260

 
3,863

Equity plan-related compensation expense
$
6,306

 
$
5,829

 
$
11,453

 
$
11,509