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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Mar. 09, 2017
Loss Contingencies [Line Items]      
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 2,461    
Operating Leases, Future Minimum Payments Due, Next Twelve Months 1,500    
Maximum exposure of indemnification liability   $ 19,000  
Operating Leases, Future Minimum Payments, Due in Two Years 3,400    
Operating Leases, Future Minimum Payments, Due in Three Years 3,400    
Operating Leases, Future Minimum Payments, Due in Four Years 3,400    
Operating Leases, Future Minimum Payments, Due in Five Years 3,400    
Operating Leases, Future Minimum Payments Due 15,100    
Operating Leases, Future Minimum Payments, Due in Two Years 2,749    
Operating Leases, Future Minimum Payments, Due in Three Years 2,749    
Operating Leases, Future Minimum Payments, Due in Four Years 2,749    
Operating Leases, Future Minimum Payments, Due in Five Years 2,749    
Operating Leases, Future Minimum Payments, Due Thereafter 6,187    
Operating Leases, Future Minimum Payments Due $ 19,644    
Groupon Latin America      
Loss Contingencies [Line Items]      
Estimated indemnification liability     $ 5,400