v3.26.1
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 $ 91,631 $ 99,636 $ 95,523
Capitalized interest (765) (1,005) (142)
Amort. Debt (Premium) Discount 89 115 124
Amort. Deferred Cost & Other Fees 4,017 4,070 4,064
Total Interest Expense $ 95,737 $ 103,821 $ 99,711
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
Other debt      
Debt Instrument [Line Items]      
Cash Interest 262 380 12
Amort. Debt (Premium) Discount 0 0 0
Amort. Deferred Cost & Other Fees 0 0 0
Total Interest Expense $ 262 $ 380 $ 12