DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Deferred financing costs	$ (7,114)	$ (8,980)
Long-term debt	764,838	762,687
Secured Debt | New Senior Secured Term Loan Facility due May 26, 2028
Debt Instrument [Line Items]
Carrying Value	371,952	371,667
Secured Debt | Senior Notes Due June 1, 2031
Debt Instrument [Line Items]
Carrying Value	400,000	400,000
Secured Debt | ABL Credit Facility
Debt Instrument [Line Items]
Carrying Value	$ 0	$ 0