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BUSINESS COMBINATIONS BUSINESS COMBINATIONS - YEAR ENDED JANUARY 31, 2016 - PURCHASE PRICE ALLOCATIONS (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2016
Jan. 31, 2018
Jan. 31, 2017
Business Acquisition      
Goodwill $ 1,207,176 $ 1,388,299 $ 1,264,818
Individually Insignificant Business Combinations - Year Ended January 31, 2016      
Business Acquisition      
Payment Made At Closing To Acquire Businesses 33,222    
Fair value of contingent obligation 16,237    
Business Combination, Consideration Transferred 49,459    
Accounts receivable 992    
Other current assets, including cash acquired 4,274    
Other assets 395    
Current and other liabilities (3,037)    
Deferred Revenue - Current and Long-Term (1,872)    
Deferred Income Taxes (2,922)    
Net Tangible Assets (Liabilities) (2,170)    
Identifiable intangible assets 22,912    
Goodwill 28,717    
Total Purchase Price Allocations 49,459    
Customer Relationships | Individually Insignificant Business Combinations - Year Ended January 31, 2016      
Business Acquisition      
Identifiable intangible assets 1,212    
Acquired Technology | Individually Insignificant Business Combinations - Year Ended January 31, 2016      
Business Acquisition      
Identifiable intangible assets 20,300    
Trademarks and Trade Names | Individually Insignificant Business Combinations - Year Ended January 31, 2016      
Business Acquisition      
Identifiable intangible assets 300    
In Process Research and Development | Individually Insignificant Business Combinations - Year Ended January 31, 2016      
Business Acquisition      
Identifiable intangible assets $ 1,100