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Contingencies and Commitments - Future Minimum Non-Cancelable Lease Payments (Detail) - Office Space [Member]
$ in Thousands
Sep. 30, 2018
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2019 $ 75,159
2020 68,847
2021 57,903
2022 47,849
2023 20,670
Thereafter 23,459
Total $ 293,887