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Commitments and Contingencies - Future Purchase Obligations (Details)
$ in Thousands
Apr. 30, 2019
USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]  
Fiscal 2020, remainder $ 6,142
Fiscal 2021 10,987
Fiscal 2022 9,379
Fiscal 2023 898
Fiscal 2024 943
Thereafter 4,555
Total $ 32,904