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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Summary Of Significant Accounting Policies [Line Items] |  |
Opening balance | $ 2,404 | $ 565
Charged to expense | (4) | 0
Accounts written off | (20) | 0
Establishment of archive reserve | 0 | 3,216
Uncollected archive invoices | (452) | (1,377)
Ending balance | $ 1,948 | $ 2,404

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