BUSINESS COMBINATIONS BUSINESS COMBINATIONS - CONTACT SOLUTIONS - PURCHASE PRICE ALLOCATION (Details) - USD ($)
$ in Thousands
Feb. 19, 2016
Apr. 30, 2016
Jan. 31, 2016
Business Acquisition [Line Items]      
Goodwill   $ 1,248,110 $ 1,207,176
Enterprise Intelligence      
Business Acquisition [Line Items]      
Goodwill   $ 1,088,643 $ 1,048,955
Enterprise Intelligence | Contact Solutions, LLC      
Business Acquisition [Line Items]      
Cash Paid at Closing $ 66,915    
Post-closing purchase price adjustment 2,439    
Business Combination, Consideration Transferred 69,354    
Accounts receivable 8,102    
Other current assets, including cash acquired 2,392    
Property and equipment 7,059    
Other assets 1,904    
Current and other liabilities (4,943)    
Deferred revenue - current and long-term (642)    
Net Tangible Assets Acquired 13,872    
Identifiable intangible assets 33,500    
Goodwill 21,982    
Total purchase price allocations 69,354    
Customer Relationships | Enterprise Intelligence | Contact Solutions, LLC      
Business Acquisition [Line Items]      
Identifiable intangible assets 18,000    
Acquired Technology | Enterprise Intelligence | Contact Solutions, LLC      
Business Acquisition [Line Items]      
Identifiable intangible assets 13,100    
Trademarks and Trade Names | Enterprise Intelligence | Contact Solutions, LLC      
Business Acquisition [Line Items]      
Identifiable intangible assets $ 2,400