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Commitments and Contingencies - Future Payments under Non-cancellable Contractual Purchases (Details)
$ in Thousands
Apr. 30, 2018
USD ($)
Purchase Obligation Fiscal Year Maturity [Abstract]  
Remainder of 2019 $ 21,845
2020 46,594
2021 11,383
2022 1,514
2023 851
Thereafter 694
Total $ 82,881