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Goodwill and Intangible Assets - Schedule of Finite Lived Intangible Assets Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Goodwill and intangible assets    
2022 $ 1,593  
2023 1,138  
2024 1,053  
2025 1,053  
2026 1,053  
Thereafter 12,372  
Net book value $ 18,262 $ 307