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Equity - Schedule of Non-Vested Restricted Stock Units Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expected compensation expense related to RSUs	$ 447	$ 568
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expected compensation expense related to RSUs	14,975
Recognized compensation expense related to RSUs	(11,590)
Unrecognized compensation expense for RSUS	$ 3,385
Weighted average remaining period to expense for RSUs	2 years 9 months 18 days

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