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INCOME TAXES - Effective income tax rate (Details)
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
INCOME TAXES    
Federal statutory income tax rate (as a percent) 21.00% 21.00%
Increases (decreases):    
State and local income taxes, net of Federal tax benefit, if applicable 2.60% 0.10%
Change in Tax Rates 0.60%  
Loss on Fair Value Re-measurement of Embedded Derivative (2.90%)  
Nondeductible Compensation (1.00%)  
Other nondeductible expenses (0.20%) (24.30%)
Goodwill (16.40%) 3.30%
Disregarded entities 0.60%  
Foreign rate differential (0.40%)  
Valuation allowance changes from activity 0.10% 3.30%
Valuation allowance changes from acquisitions 0.30% (81.40%)
Effective income tax rate 4.30% (78.00%)