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Business Combinations Business Combinations (Tables)
 9 Months Ended
Oct. 31, 2014
Business Acquisition [Line Items]  
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
Acquisitions during the nine months ended October 31, 2014
 
Total Consideration
 
Net Tangible Assets Acquired
 
Identifiable Intangible Assets Acquired
 
Goodwill
Berkeley Design Automation, Inc.
$
51,303

 
$
2,335

 
$
24,770

 
$
24,198

Other
42,165

 
827

 
13,440

 
27,898

     Total
$
93,468

 
$
3,162

 
$
38,210

 
$
52,096