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SALE OF RECEIVABLES - Summary (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Transfers and Servicing [Abstract]      
Receivables outstanding in facility $ 81,171 $ 123,526 $ 228,621
Beneficial interest 17,512 23,668 48,715
Servicing liability 0 0 81
Cash proceeds for the six months ended:      
Cash purchase price 243,546 228,930 694,517
Deferred purchase price 114,212 118,118 263,670
Service fees 303 225 473
Total $ 358,061 $ 347,273 $ 958,660