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Business Combinations Business Combinations (Tables)
 6 Months Ended
Jul. 31, 2014
Business Acquisition [Line Items]  
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
Acquisitions during the six months ended July 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
39,094

 
1,606

 
12,540

 
24,948

     Total
$
90,397

 
$
3,941

 
$
37,310

 
$
49,146