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EARNINGS PER SHARE - Reconciliation of Shares Used to Calculate Basic and Diluted Earnings Per Share (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Class A Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Basic shares (in shares) | 24,723,479 | 26,078,625 | 25,211,171 | 25,964,448
Assumed conversion of restricted shares (in shares) | 0 | 0 | 406,281 | 0
Diluted shares (in shares) | 24,723,479 | 26,078,625 | 25,617,452 | 25,964,448
Class B Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Basic shares (in shares) | 21,485,063 | 21,331,127 | 21,400,064 | 21,331,127
Diluted shares (in shares) | 21,485,063 | 21,331,127 | 21,400,064 | 21,331,127

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