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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2018	Oct. 01, 2017
Income Taxes [Line Items]
Income tax provision	$ 99	$ 74	$ 3,713	$ 74
Effective tax rate			(117.00%)
Income tax provision related to the enactment of the Tax Act			$ 4,400
ASU 2016-09 | Retained Earnings
Income Taxes [Line Items]
Cumulative effect of new accounting principle in period of adoption						$ 8,300
Scenario, Forecast
Income Taxes [Line Items]
Blended tax rate					24.30%

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Income taxes.

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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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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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