v3.26.1
LONG-TERM DEBT - Narrative (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2026
USD ($)
May 08, 2023
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
May 09, 2019
USD ($)
Debt Instrument [Line Items]              
Debt issuance costs, gross $ 0   $ 0 $ 249,000 $ 0 $ 249,000  
Amortization of debt issuance costs     $ 216,000 216,000 $ 647,000 746,000  
Debt issuance costs written off       $ 295,000   $ 295,000  
Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Commitment Fee 0.15%            
Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | One, Two, Three or Six-month SOFR              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.00%            
Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | One, Two, Three or Six-month SOFR | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate   2.00%          
Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | One, Two, Three or Six-month SOFR | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate   3.00%          
Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | SOFR plus 1%              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.00%            
Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | SOFR plus 1% | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate   1.00%          
Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | SOFR plus 1% | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate   2.00%          
Revolving Credit Facility | Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Revolving line of credit borrowing capacity   $ 400,000,000         $ 450,000
Optional addition to borrowing capacity   $ 100,000          
Consolidation basis (as a percent)   1          
Minimum consolidated interest coverage ratio 13.5 3.0 13.5   13.5    
Maximum total leverage ratio 1.9 5.0 1.9   1.9    
Commitment fee multiplier   $ 400,000          
Revolving Credit Facility | Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | Minimum              
Debt Instrument [Line Items]              
Commitment Fee   0.15%          
Revolving Credit Facility | Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | Maximum              
Debt Instrument [Line Items]              
Commitment Fee   0.30%          
Revolving Credit Facility | Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | One, Two, Three or Six-month SOFR              
Debt Instrument [Line Items]              
Basis spread on variable rate   0.10%          
Revolving Credit Facility | Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | Adjusted Term SOFR              
Debt Instrument [Line Items]              
Basis spread on variable rate   0.00%          
Revolving Credit Facility | Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | Federal Funds Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate   0.50%          
Revolving Credit Facility | Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR)              
Debt Instrument [Line Items]              
Basis spread on variable rate   1.00%          
Revolving Credit Facility | Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility | Line of Credit | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate   1.00%