ACCOUNTING POLICIES - Schedule of ASC 326 Adoption (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	$ 7,676
Provision for credit losses	394	$ (110)
Ending balance	$ 7,313		$ 7,676
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member		us-gaap:AccountingStandardsUpdate201613Member
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	$ (757)
Ending balance			$ (757)