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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, 2020	Sep. 30, 2019	Sep. 30, 2018
Effective income tax rates as compared to the U.S. Federal income tax rate
U.S. Federal income tax rate	21.00%	21.00%	24.50%
Effect of foreign taxes	(0.20%)	(0.60%)	87.80%
State income taxes, net of federal tax benefit	2.80%	17.20%	68.80%
Remeasurement of deferred tax related to Tax Cuts and Jobs Act	0.00%	0.00%	(3169.40%)
Other impact of foreign operations	(0.50%)	0.90%	(43.40%)
Non-deductible meals and entertainment	(0.20%)	(2.50%)	8.20%
Equity compensation	(0.30%)	2.70%	(5.30%)
Excess officer's compensation	(0.20%)	(1.90%)	1.70%
Contingent consideration adjustment	0.00%	4.50%	10.70%
Other	(0.40%)	(4.80%)	4.10%
Effective income tax rate	22.00%	36.50%	(3012.30%)

X

- 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 contingent consideration 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 attributable to officer's compensation.

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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 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 changes in the income tax rates.

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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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