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Income Taxes - Schedule of Reconciliation of Total Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Uncertainties [Abstract]
Unrecognized tax benefits beginning balance	$ 7,547	$ 7,547	$ 7,547
Gross increases — tax positions in prior period	0	0	0
Gross decreases — tax positions in prior period	(2,859)	0	0
Gross increases — tax positions in current period	0	0	0
Settlement	0	0	0
Lapse of statute of limitations	0	0	0
Unrecognized tax benefits ending balance	$ 4,688	$ 7,547	$ 7,547

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Amount of unrecognized tax benefits.

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