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Business Combinations (Tables)
 12 Months Ended
Jan. 31, 2015
Business Acquisition [Line Items]  
Schedule of Business Acquisitions, by Acquisition
Acquisitions during the twelve months ended January 31, 2015
 
Total Consideration
 
Net Tangible Assets Acquired
 
Identifiable Intangible Assets Acquired
 
Goodwill
Berkeley Design Automation, Inc.
$
51,303

 
$
2,335

 
$
24,770

 
$
24,198

Other
49,315

 
876

 
15,160

 
33,279

     Total
$
100,618

 
$
3,211

 
$
39,930

 
$
57,477