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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) | Mar. 31, 2019 | Oct. 01, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Disaggregation of Revenue [Line Items] |  |  |
Retained earnings | $ 258,600,000 |  | $ 213,048,000
Accounting Standards Update 2014-09 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 1,502,000 |
Refund Transfer Fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Accounts Receivable, Gross, Current | $ 0 |  | $ 827,039

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