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INCOME TAXES - Reconciliation of Federal Statutory Tax Rate to Consolidated Effective Tax Rate (Details) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Disclosure [Abstract] |  |  |
Federal statutory tax rate | 21.00% | 21.00% | 21.00%
Effect of state income taxes, net of federal deduction | 3.80% | 0.20% | 37.50%
Foreign statutory taxes compared to federal statutory rate | (0.70%) | 1.60% | (18.60%)
Share-based compensation | 3.60% | (1.10%) | 24.50%
Termination of SERP | 0.00% | 0.00% | 28.60%
Tax credits | (7.00%) | 1.20% | (26.60%)
Sale of SERP-related investments | 0.00% | 0.00% | 23.80%
Goodwill write-down | 0.00% | (11.20%) | 0.00%
Tax rate differential on net operating loss carryback | 0.00% | 0.00% | (21.40%)
Nontaxable income | (7.50%) | 0.80% | (9.90%)
Tax rate differential on net operating loss carryback | (5.60%) | 0.00% | 0.00%
Other | (3.30%) | (8.30%) | 10.10%
Effective tax rate | 4.30% | 4.20% | 69.00%

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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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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