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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred income taxes				$ (22,139)	$ 16,190
Income tax (benefit) expense	$ (3,495)		$ 9,065	(24,676)	$ 16,175
Restricted cash	$ 3,823			$ 3,823		$ 3,559
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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