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Leases and Commitments - Schedule of Future Minimum Lease Obligations under Non-cancelable Operating Leases (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Operating Leases Future Minimum Payments Due [Abstract]  
2020 $ 47,814
2021 46,007
2022 31,090
2023 13,726
2024 13,185
Thereafter 1,368
Total $ 153,190