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INCOME TAXES - Effective Income Tax Rates as Compared to the U.S. Federal Income Tax Rate (Details) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Effective income tax rates as compared to the U.S. Federal income tax rate |  |  |
U.S. Federal income tax rate | 21.00% | 21.00% | 21.00%
Effect of foreign taxes | 2.10% | 31.30% | 0.10%
State income taxes, net of federal tax benefit | 2.40% | 21.40% | 2.70%
Other impact of foreign operations | 0.20% | 3.20% | 0.50%
Non-deductible meals and entertainment | 0.60% | 1.00% | (0.10%)
Equity compensation | (0.10%) | 9.50% | (0.80%)
Excess officer's compensation | 0.40% | 3.70% | 0.00%
Foreign derived intangible income | 0.00% | (13.70%) | 0.00%
Other | 0.20% | 0.40% | 0.70%
Effective income tax rate | 26.80% | 77.80% | 24.10%

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