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Commitments and Contingencies - Summary of Future Minimum Lease Payments Under Non-cancelable Operating Leases (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2020 $ 9,480
2021 8,148
2022 6,906
2023 6,329
2024 5,003
Thereafter 29,111
Total $ 64,977