STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION - Summary of restricted stock activity (Details)	12 Months Ended
	Sep. 30, 2022 $ / shares shares
Shares
Unvested (in shares)	3,601,000
Unvested (in shares)	3,457,000
Restricted Stock
Shares
Unvested (in shares)	3,866,053
Granted (in shares)	1,004,755
Vested (in shares)	(1,015,740)
Forfeited (in shares)	(151,501)
Unvested (in shares)	3,703,567
Weighted Average Grant- Date Fair Value
Unvested (in dollars per share) | $ / shares	$ 15.32
Granted (in dollars per share) | $ / shares	21.35
Vested (in dollars per share) | $ / shares	25.46
Forfeited (in dollars per share) | $ / shares	17.63
Unvested (in dollars per share) | $ / shares	$ 24.70