LONG-TERM DEBT - Schedule of Interest Expense Incurred (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Debt Instrument [Line Items]
Cash Interest, Capitalized Interest	$ (309)	$ (38)	$ (813)	$ (49)
Cash Interest	25,968	24,619	75,302	72,100
Amort. Debt (Premium)/Discount	31	31	92	93
Amort. Debt Issuance Costs & Other Fees	1,025	991	3,078	2,975
Total Interest Expense	$ 27,024	$ 25,641	$ 78,472	$ 75,168
Senior notes due 2028
Debt Instrument [Line Items]
Effective Interest Rate	6.00%	6.00%	6.00%	6.00%
Cash Interest, Including Amounts Capitalized	$ 14,013	$ 14,013	$ 42,037	$ 42,037
Amort. Debt (Premium)/Discount	(12)	(12)	(36)	(36)
Amort. Debt Issuance Costs & Other Fees	505	505	1,515	1,515
Total Interest Expense	$ 14,506	$ 14,506	$ 43,516	$ 43,516
Term Loan B due 2029
Debt Instrument [Line Items]
Effective Interest Rate	8.20%	7.80%	8.20%	7.30%
Cash Interest, Including Amounts Capitalized	$ 9,070	$ 9,208	$ 27,314	$ 25,753
Amort. Debt (Premium)/Discount	43	43	128	129
Amort. Debt Issuance Costs & Other Fees	331	351	992	1,054
Total Interest Expense	9,444	9,602	28,434	26,936
Revolver due 2028
Debt Instrument [Line Items]
Cash Interest, Including Amounts Capitalized	3,114	905	6,253	2,922
Amort. Debt (Premium)/Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	186	123	559	368
Total Interest Expense	3,300	$ 1,028	6,812	$ 3,290
Finance lease - real estate
Debt Instrument [Line Items]
Effective Interest Rate		5.60%		5.60%
Cash Interest, Including Amounts Capitalized	0	$ 168	0	$ 520
Amort. Debt (Premium)/Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	0	0	0	0
Total Interest Expense	0	168	0	520
Non US lines of credit
Debt Instrument [Line Items]
Cash Interest, Including Amounts Capitalized	19	259	33	619
Amort. Debt (Premium)/Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	3	12	11	37
Total Interest Expense	22	271	44	656
Other long term debt
Debt Instrument [Line Items]
Cash Interest, Including Amounts Capitalized	61	104	478	298
Amort. Debt (Premium)/Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	0	0	1	1
Total Interest Expense	$ 61	$ 104	$ 479	$ 299