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Commitments and Contingencies - Schedule of Minimum Rental Commitments under Non-cancelable Operating Leases (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2020 $ 110,858
2021 103,185
2022 88,086
2023 70,839
2024 54,185
Thereafter 100,256
Total minimum lease payments $ 527,409