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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, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Disclosure [Abstract] |  |  |
Federal statutory tax rate | 21.00% | 21.00% | 21.00%
Effect of state income taxes, net of federal deduction | 1.30% | 3.80% | 0.20%
Foreign statutory taxes compared to federal statutory rate | 19.60% | (0.70%) | 1.60%
Share-based compensation | (0.70%) | 3.60% | (1.10%)
Tax credits (net of withholding taxes) | 3.60% | (7.00%) | 1.20%
Goodwill write-down | (4.90%) | 0.00% | (11.20%)
Nontaxable income | 5.00% | (7.50%) | 0.80%
Nondeductible held-for-sale asset write-downs | (0.040) | 0 | 0
Change in realizability of foreign deferred tax assets | (30.70%) | (9.50%) | (5.80%)
Other | 4.20% | 0.60% | (2.50%)
Effective tax rate | 14.40% | 4.30% | 4.20%

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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 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 + Details
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