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Income Taxes - Reconciliation of Income Tax Rate (Details)	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income taxes computed at the federal statutory rate	24.53%	35.00%
State taxes, net of federal benefit	2.50%	2.50%
Tax Cuts and Jobs Act transitional impact	9.60%	0.00%
Permanent items	(2.90%)	(0.00%)
Net income attributable to noncontrolling interest	(10.40%)	(16.90%)
Total	23.30%	20.60%

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Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act, Percent

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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 noncontrolling interest income (loss) exempt from income taxes.

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