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Income Taxes - Components of Income Taxes Provision (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Current provision:
Federal									$ 2,321	$ 496	$ 209
State									(366)	73	87
Total current provision									1,955	569	296
Deferred provision (benefit):
Federal									10,190	11,691	(22,056)
State									2,116	(52)	(5,654)
Total deferred provision (benefit)									12,306	11,639	(27,710)
Total income tax provision (benefit)	$ 1,852	$ 9,094	$ 1,484	$ 1,831	$ 678	$ 9,285	$ 1,497	$ 748	$ 14,261	$ 12,208	$ (27,414)

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- Definition

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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