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Contingencies and Commitments - Future Minimum Non-Cancelable Lease Payments (Detail) - Office Space [Member]
$ in Thousands
Sep. 30, 2019
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2020 $ 69,043
2021 60,544
2022 51,863
2023 31,951
2024 24,350
Thereafter 93,845
Total $ 331,596