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EARNINGS PER SHARE - Company's Class A and Class B Common and Treasury Shares (Details) - shares | Mar. 31, 2026 | Sep. 30, 2025
--- | --- | ---
Class A Common Stock |  |
Class of Stock [Line Items] |  |
Authorized Shares (in shares) | 128,000,000 | 128,000,000
Issued Shares (in shares) | 42,281,920 | 42,281,920
Outstanding Shares (in shares) | 24,776,629 | 26,169,944
Treasury Shares (in shares) | 17,505,291 | 16,111,976
Class B Common Stock |  |
Class of Stock [Line Items] |  |
Authorized Shares (in shares) | 69,120,000 | 69,120,000
Issued Shares (in shares) | 34,560,000 | 34,560,000
Outstanding Shares (in shares) | 21,391,398 | 21,331,127
Treasury Shares (in shares) | 13,168,602 | 13,228,873

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