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Leases - Future Lease Payments (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019
Future lease payments due:
Fiscal 2020, remainder	$ 11,227
Fiscal 2021	26,340
Fiscal 2022	27,291
Fiscal 2023	27,697
Fiscal 2024	27,784
Thereafter	79,339
Total undiscounted cash flows	199,678
Less imputed interest	(31,992)
Present value of lease liabilities	$ 167,686
Weighted average remaining term (years)	8 years 2 months 12 days
Weighted average discount rate	4.40%
Future minimum annual lease payments:
Fiscal 2020		$ 22,198
Fiscal 2021		22,617
Fiscal 2022		22,556
Fiscal 2023		23,173
Fiscal 2024		23,373
Thereafter		34,634
Total minimum lease payments		$ 148,551

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