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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change in Accounting Principle [Line Items]
Income tax (benefit) expense	$ 5,949	$ (21,789)
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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