EARNINGS PER SHARE - Company's Class A and Class B Common and Treasury Shares (Details) - shares	Dec. 31, 2025	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)	24,356,344	26,169,944
Treasury Shares (in shares)	17,925,576	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)	21,221,039	21,331,127
Treasury Shares (in shares)	13,338,961	13,228,873