v3.26.1
LONG-TERM DEBT - Summary of long-term debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Debt Instrument [Line Items]    
Outstanding Balance $ 1,423,811 $ 1,539,393
less: Current portion (8,033) (8,077)
Long-term debt 1,415,778 1,531,316
Original Issuer Premium (Discount) (340) (430)
Capitalized Fees & Expenses (11,162) (15,179)
Balance Sheet 1,412,309 1,523,784
less: Current portion (8,033) (8,077)
Long-term debt 1,404,276 1,515,707
Senior Notes due 2028    
Debt Instrument [Line Items]    
Outstanding Balance 974,775 974,775
Original Issuer Premium (Discount) 121 169
Capitalized Fees & Expenses (4,880) (6,900)
Balance Sheet $ 970,016 $ 968,044
Coupon Interest Rate 5.75% 5.75%
Term Loan B due 2029    
Debt Instrument [Line Items]    
Outstanding Balance $ 449,000 $ 457,000
Original Issuer Premium (Discount) (461) (599)
Capitalized Fees & Expenses   (5,420)
Balance Sheet 444,370 450,981
Revolver due 2028    
Debt Instrument [Line Items]    
Outstanding Balance 0 107,500
Original Issuer Premium (Discount) 0 0
Capitalized Fees & Expenses (2,113) (2,859)
Balance Sheet (2,113) 104,641
Other debt    
Debt Instrument [Line Items]    
Outstanding Balance 36 118
Original Issuer Premium (Discount) 0 0
Capitalized Fees & Expenses 0 0
Balance Sheet $ 36 $ 118