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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment, Advertising Expenses: (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Accounts Receivable              
Unbilled amounts included in accounts receivable   $ 14,300     $ 14,100 $ 14,300  
Asset impairment charges              
Goodwill impairment $ 0   $ 0        
Impairment of other long-lived assets           900  
Advertising Expense              
Advertising expense         $ 9,300 5,900 $ 5,000
Brazil reporting unit              
Asset impairment charges              
Goodwill impairment           502  
APAC reporting unit              
Asset impairment charges              
Goodwill impairment           5,413  
Minimum              
Internally developed software              
Amortization period         2 years    
Data Acquisition Costs              
Estimated useful life of data         2 years    
Minimum | Data processing equipment              
Property and equipment and software              
Estimated useful lives         2 years    
Minimum | Office furniture and other equipment              
Property and equipment and software              
Estimated useful lives         3 years    
Minimum | Developed technology.              
Internally developed software              
Amortization period         2 years    
Maximum              
Internally developed software              
Amortization period         10 years    
Purchased software licenses              
Amortization period         5 years    
Data Acquisition Costs              
Estimated useful life of data         7 years    
Maximum | Buildings and improvements              
Property and equipment and software              
Estimated useful lives         30 years    
Maximum | Data processing equipment              
Property and equipment and software              
Estimated useful lives         5 years    
Maximum | Office furniture and other equipment              
Property and equipment and software              
Estimated useful lives         7 years    
Maximum | Developed technology.              
Internally developed software              
Amortization period         5 years    
Marketing Services and Audience Solutions | Brazil reporting unit              
Asset impairment charges              
Asset impairment charges       $ 700      
Goodwill impairment       500   502  
Impairment of other long-lived assets       $ 200      
Marketing Services and Audience Solutions | APAC reporting unit              
Asset impairment charges              
Asset impairment charges   6,100          
Goodwill impairment   5,400          
Impairment of other long-lived assets   $ 700     $ 0    
Audience Solutions | APAC reporting unit              
Asset impairment charges              
Goodwill impairment           $ 5,413