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Equity - Schedule of Non-Vested Restricted Stock Units Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expected compensation expense related to RSUs	$ 388	$ 352
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expected compensation expense related to RSUs	17,169
Recognized compensation expense related to RSUs	(14,703)
Unrecognized compensation expense related to RSUs	$ 2,466
Weighted average remaining years to expense for RSUs	2 years 9 months 18 days

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