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Commitments and Contingencies - Future Payments under Non-cancellable Contractual Purchases (Details)
$ in Thousands
Oct. 31, 2018
USD ($)
Purchase Obligation Fiscal Year Maturity [Abstract]  
Remainder of 2019 $ 10,761
2020 47,478
2021 12,267
2022 2,280
2023 1,315
Thereafter 694
Total $ 74,795