LONG-TERM DEBT - Schedule of Leverage Ratio Covenants (Details) - Senior Secured Credit Facility	9 Months Ended
	Jun. 30, 2018
June 30, 2018 through June 30, 2020
Line of Credit Facility [Line Items]
Ratio of total debt to Consolidated EBITDA	6.25
Ratio of total debt to Consolidated EBITDA	4.50
September 30, 2020 through June 30, 2021
Line of Credit Facility [Line Items]
Ratio of total debt to Consolidated EBITDA	6.00
Ratio of total debt to Consolidated EBITDA	4.25
September 30, 2021 through June 30, 2022
Line of Credit Facility [Line Items]
Ratio of total debt to Consolidated EBITDA	5.75
Ratio of total debt to Consolidated EBITDA	4.00
September 30, 2022 through June 30, 2023
Line of Credit Facility [Line Items]
Ratio of total debt to Consolidated EBITDA	5.50
Ratio of total debt to Consolidated EBITDA	3.75
September 30, 2023 and each fiscal quarter ending thereafter
Line of Credit Facility [Line Items]
Ratio of total debt to Consolidated EBITDA	5.25