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