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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Statutory income tax rate	24.53%	35.00%	35.00%
State income tax	2.00%	1.00%	1.00%
Impact of change in Federal income tax rate	(2.00%)	0.00%	0.00%
Other differences	(4.00%)	(4.00%)	(2.00%)
Effective income tax rate	21.00%	32.00%	34.00%

X

- Definition

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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