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LONG-TERM DEBT - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Debt Instrument [Line Items]    
Long-term debt, Outstanding Balance $ 1,550,599 $ 1,539,685
less: Current portion, Outstanding Balance (8,133) (8,155)
Long-term debt, Outstanding Balance 1,542,466 1,531,530
Original Issuer Premium/(Discount) (385) (430)
Capitalized Fees & Expenses (13,243) (15,203)
Long-term debt, Balance Sheet 1,536,971 1,524,052
less: Current portion, Balance Sheet (8,133) (8,155)
Long-term debt, Balance Sheet 1,528,838 1,515,897
Senior notes due 2028    
Debt Instrument [Line Items]    
Long-term debt, Outstanding Balance 974,775 974,775
Original Issuer Premium/(Discount) 145 169
Capitalized Fees & Expenses (5,890) (6,900)
Long-term debt, Balance Sheet $ 969,030 $ 968,044
Coupon Interest Rate 5.75% 5.75%
Term Loan B due 2029    
Debt Instrument [Line Items]    
Long-term debt, Outstanding Balance $ 453,000 $ 457,000
Original Issuer Premium/(Discount) (530) (599)
Capitalized Fees & Expenses (4,795) (5,420)
Long-term debt, Balance Sheet 447,675 450,981
Revolver due 2028    
Debt Instrument [Line Items]    
Long-term debt, Outstanding Balance 122,500 107,500
Original Issuer Premium/(Discount) 0 0
Capitalized Fees & Expenses (2,486) (2,859)
Long-term debt, Balance Sheet 120,014 104,641
Non US lines of credit    
Debt Instrument [Line Items]    
Long-term debt, Outstanding Balance 0 0
Original Issuer Premium/(Discount) 0 0
Capitalized Fees & Expenses (72) (2)
Long-term debt, Balance Sheet (72) (2)
Other long term debt    
Debt Instrument [Line Items]    
Long-term debt, Outstanding Balance 324 410
Original Issuer Premium/(Discount) 0 0
Capitalized Fees & Expenses 0 (22)
Long-term debt, Balance Sheet $ 324 $ 388