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Securitized Receivables - Summary (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Transfers and Servicing [Abstract]      
Receivables outstanding in facility $ 126,006 $ 81,171 $ 210,672
Beneficial interests 25,579 17,512 40,332
Servicing liability 23 0 90
Cash proceeds for the six months ended:      
Cash purchase price 228,072 243,546 672,333
Deferred purchase price 127,707 114,212 242,966
Service fees 237 303 576
Total $ 356,016 $ 358,061 $ 915,875