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INCOME TAXES (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2025
Jun. 25, 2018
Class of Stock [Line Items]            
Provision for income taxes $ 478 $ 2,885 $ 1,182 $ 3,294    
Tax benefits payable to continuing equity owners (as a percent)           85.00%
Tax benefits retained (percent)           15.00%
Accrued expenses and other current liabilities 20,025   20,025   $ 24,525  
Long-term tax receivable agreement obligations 32,379   $ 32,379   $ 32,191  
Period of payment to continuing equity owners     22 years      
Minimum            
Class of Stock [Line Items]            
Expected payments for repurchase of redeemable noncontrolling interest 0   $ 0      
Maximum            
Class of Stock [Line Items]            
Expected payments for repurchase of redeemable noncontrolling interest 5,364   5,364      
Continuing Equity Owners | Class B Common Stock            
Class of Stock [Line Items]            
Deferred tax asset recognized 36,222   36,222      
Tax benefits due to continuing equity owners $ 32,379   $ 32,379