LONG-TERM DEBT - Schedule of Interest Expense Incurred (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Debt Instrument [Line Items]
Cash Interest, Capitalized Interest	$ (308)	$ (9)	$ (504)	$ (11)
Cash Interest	25,091	23,856	49,334	47,481
Amort. Debt (Premium)/Discount	30	31	61	62
Amort. Debt Issuance Costs & Other Fees	1,028	992	2,053	1,984
Total Interest Expense	$ 26,149	$ 24,879	$ 51,448	$ 49,527
Senior notes due 2028
Debt Instrument [Line Items]
Effective Interest Rate	6.00%	6.00%	6.00%	6.00%
Cash Interest, Including Amounts Capitalized	$ 14,012	$ 14,012	$ 28,024	$ 28,024
Amort. Debt (Premium)/Discount	(12)	(12)	(24)	(24)
Amort. Debt Issuance Costs & Other Fees	505	505	1,010	1,010
Total Interest Expense	$ 14,505	$ 14,505	$ 29,010	$ 29,010
Term Loan B due 2029
Debt Instrument [Line Items]
Effective Interest Rate	8.20%	7.50%	8.20%	7.00%
Cash Interest, Including Amounts Capitalized	$ 9,027	$ 8,737	$ 18,244	$ 16,545
Amort. Debt (Premium)/Discount	42	43	85	86
Amort. Debt Issuance Costs & Other Fees	331	352	661	703
Total Interest Expense	9,400	9,132	18,990	17,334
Revolver due 2028
Debt Instrument [Line Items]
Cash Interest, Including Amounts Capitalized	2,231	673	3,139	2,017
Amort. Debt (Premium)/Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	187	122	373	245
Total Interest Expense	2,418	$ 795	3,512	$ 2,262
Finance lease - real estate
Debt Instrument [Line Items]
Effective Interest Rate		5.60%		5.60%
Cash Interest, Including Amounts Capitalized	0	$ 174	0	$ 352
Amort. Debt (Premium)/Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	0	0	0	0
Total Interest Expense	0	174	0	352
Non US lines of credit
Debt Instrument [Line Items]
Cash Interest, Including Amounts Capitalized	14	205	14	360
Amort. Debt (Premium)/Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	4	12	8	25
Total Interest Expense	18	217	22	385
Non US term loans
Debt Instrument [Line Items]
Cash Interest, Including Amounts Capitalized			0	0
Amort. Debt (Premium)/Discount			0	0
Amort. Debt Issuance Costs & Other Fees			0	0
Total Interest Expense			0	0
Other long term debt
Debt Instrument [Line Items]
Cash Interest, Including Amounts Capitalized	115	64	417	194
Amort. Debt (Premium)/Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	1	1	1	1
Total Interest Expense	$ 116	$ 65	$ 418	$ 195