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INCOME TAXES - Effective Income Tax Rates as Compared to the U.S. Federal Income Tax Rate (Details)	12 Months Ended
	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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- 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 attributable to officer's compensation.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of reported income tax benefit from difference to income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to foreign-derived intangible income (FDII).

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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.

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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 attributable to meals and entertainment expense.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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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 attributable to other adjustments.

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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 state and local income tax expense (benefit), net of federal tax expense (benefit).

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