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Equity - Schedule of Non-Vested Restricted Stock Units Compensation (Detail) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expected compensation expense related to RSUs	$ 894	$ 1,125
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	(12,037)
Unrecognized compensation expense for RSUS	$ 2,938
Weighted average remaining years to expense for RSUs	2 years 7 months 6 days

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