INCOME TAXES - Schedule of effective income tax rate reconciliation (Details)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
U.S. Federal statutory income tax rate	21.00%	21.00%	21.00%
State and local taxes, net of Federal benefit	(5.30%)	4.80%	7.90%
Non-U.S. taxes - foreign permanent items and taxes	(1.50%)	3.10%	4.20%
Change in tax contingency reserves	(0.10%)	0.20%	0.20%
Impact of foreign rate change on deferred tax balances	0.00%	2.80%	0.00%
Tax Reform-Repatriation of Foreign Earnings and GILTI	0.20%	0.40%	0.30%
Change in valuation allowance	(1.70%)	0.40%	(2.60%)
Other non-deductible/non-taxable items, net	(0.004)	0.004	0.014
Non-deductible officer's compensation	(1.90%)	4.00%	5.50%
Research and U.S. foreign tax credits	0.20%	(0.10%)	1.40%
Goodwill impairment	(17.10%)	0.00%	0.00%
Share based compensation	0.40%	(2.00%)	0.00%
Other	0.00%	1.10%	(0.70%)
Effective tax rate	(6.20%)	36.10%	38.60%