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LONG-TERM DEBT - Summary of interest expense incurred (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Debt Instrument [Line Items]      
Cash Interest $ 91,836 $ 99,884 $ 97,213
Capitalized interest (765) (1,006) (142)
Amort. Debt (Premium) Discount 89 116 124
Amort. Deferred Cost & Other Fees 4,087 4,086 4,108
Total Interest Expense $ 96,012 $ 104,086 $ 101,445
Senior Notes due 2028      
Debt Instrument [Line Items]      
Effective Interest Rate 5.95% 5.93% 5.95%
Cash Interest $ 56,058 $ 56,050 $ 56,050
Amort. Debt (Premium) Discount (48) (48) (48)
Amort. Deferred Cost & Other Fees 2,020 2,020 2,020
Total Interest Expense $ 58,030 $ 58,022 $ 58,022
Term Loan B due 2029      
Debt Instrument [Line Items]      
Effective Interest Rate 6.94% 8.17% 7.49%
Cash Interest $ 30,131 $ 36,193 $ 35,321
Amort. Debt (Premium) Discount 137 163 172
Amort. Deferred Cost & Other Fees 1,251 1,304 1,398
Total Interest Expense 31,519 37,660 36,891
Revolver due 2028      
Debt Instrument [Line Items]      
Cash Interest 5,945 8,018 4,282
Amort. Debt (Premium) Discount 0 0 0
Amort. Deferred Cost & Other Fees 746 746 646
Total Interest Expense 6,691 8,764 $ 4,928
Finance lease - real estate      
Debt Instrument [Line Items]      
Effective Interest Rate     5.60%
Cash Interest     $ 680
Amort. Debt (Premium) Discount     0
Amort. Deferred Cost & Other Fees     0
Total Interest Expense     680
Non U.S. lines of credit      
Debt Instrument [Line Items]      
Cash Interest 17 43 630
Amort. Debt (Premium) Discount 0 0 0
Amort. Deferred Cost & Other Fees 70 15 42
Total Interest Expense 87 58 672
Other debt      
Debt Instrument [Line Items]      
Cash Interest 450 586 392
Amort. Debt (Premium) Discount 0 1 0
Amort. Deferred Cost & Other Fees 0 1 2
Total Interest Expense $ 450 $ 588 $ 394