v3.26.1
INCOME TAXES (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Jun. 25, 2018
Class of Stock [Line Items]            
Provision for (benefit from) income taxes $ 1,313 $ (22) $ 2,495 $ 3,272    
Tax benefits payable to continuing equity owners (as a percent)           85.00%
Tax benefits retained (percent)           15.00%
Accrued expenses and other current liabilities 21,026   21,026   $ 24,525  
Long-term tax receivable agreement obligations 32,192   $ 32,192   $ 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 of Stock [Line Items]            
Deferred tax asset recognized 35,416   35,416      
Tax benefits due to continuing equity owners 32,379   32,379      
Accrued expenses and other current liabilities 187   187      
Long-term tax receivable agreement obligations $ 32,192   $ 32,192