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INCOME TAXES - Effective income tax rate (Details) | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
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 | 0.10% | (0.10%)
Other nondeductible expenses | (24.30%) | 1.30%
Goodwill | 3.30% | (3.10%)
Valuation allowance changes from activity | 3.30% | (22.30%)
Valuation allowance changes from acquisitions | (81.40%) |
Effective income tax rate | (78.00%) | (3.20%)

X
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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