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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
New Accounting Pronouncements Or Change in Accounting Principle [Line Items]
Income tax (benefit) expense	$ 4,086	$ 608		$ 10,035	$ (21,181)
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements Or Change in Accounting Principle [Line Items]
Deferred income taxes			$ 400
Income tax (benefit) expense			300
Cumulative-effect adjustment increasing retained earnings			$ 700

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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