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LONG-TERM DEBT - Schedule of Interest Expense Incurred (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Debt Instrument [Line Items]        
Cash Interest, Capitalized Interest $ (219) $ (308) $ (366) $ (504)
Cash Interest 22,889 25,091 46,747 49,334
Amort. Debt (Premium)/Discount 22 30 45 61
Amort. Debt Issuance Costs & Other Fees 1,019 1,028 2,025 2,053
Total Interest Expense $ 23,930 $ 26,149 $ 48,817 $ 51,448
Senior notes due 2028        
Debt Instrument [Line Items]        
Effective Interest Rate 6.00% 6.00% 6.00% 6.00%
Cash Interest, Including Amounts Capitalized $ 14,020 $ 14,012 $ 28,032 $ 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 $ 14,513 $ 14,505 $ 29,018 $ 29,010
Term Loan B due 2029        
Debt Instrument [Line Items]        
Effective Interest Rate 6.80% 8.20% 7.00% 8.20%
Cash Interest, Including Amounts Capitalized $ 7,328 $ 9,027 $ 15,383 $ 18,244
Amort. Debt (Premium)/Discount 34 42 69 85
Amort. Debt Issuance Costs & Other Fees 312 331 625 661
Total Interest Expense 7,674 9,400 16,077 18,990
Revolver due 2028        
Debt Instrument [Line Items]        
Cash Interest, Including Amounts Capitalized 1,669 2,231 3,546 3,139
Amort. Debt (Premium)/Discount 0 0 0 0
Amort. Debt Issuance Costs & Other Fees 187 187 373 373
Total Interest Expense 1,856 2,418 3,919 3,512
Non US lines of credit        
Debt Instrument [Line Items]        
Cash Interest, Including Amounts Capitalized 72 14 74 14
Amort. Debt (Premium)/Discount 0 0 0 0
Amort. Debt Issuance Costs & Other Fees 15 4 17 8
Total Interest Expense 87 18 91 22
Other long term debt        
Debt Instrument [Line Items]        
Cash Interest, Including Amounts Capitalized 19 115 78 417
Amort. Debt (Premium)/Discount 0 0 0 0
Amort. Debt Issuance Costs & Other Fees 0 1 0 1
Total Interest Expense $ 19 $ 116 $ 78 $ 418