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Business Combinations Business Combinations (Tables)
 3 Months Ended
Apr. 30, 2014
Business Acquisition [Line Items]  
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
Acquisitions during the three months ended April 30, 2014

 
Total Consideration
 
Net Tangible Assets Acquired
 
Identifiable Intangible Assets Acquired
 
Goodwill
Berkeley Design Automation, Inc.
$
51,303

 
$
2,335

 
$
24,770

 
$
24,198