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Income Taxes Computed at Federal Statutory Rate (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income before income taxes	$ 28,670	$ 31,138
Tax at Federal statutory rate	7,024	10,898
Impact of Partnership loss not subject to federal income taxes	51	146
State taxes net of federal benefit	2,522	1,819
Deferred tax benefit - impact of tax reform	(11,452)
Other	343
Total tax (benefit) expense	$ (1,512)	$ 12,863

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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

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Amount 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 increase (decrease) in the income tax rates.

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