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Leases - Future Lease Payments (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Future lease payments due:
Fiscal 2020, remainder	$ 16,872
Fiscal 2021	26,319
Fiscal 2022	27,285
Fiscal 2023	27,724
Fiscal 2024	27,834
Thereafter	79,580
Total undiscounted cash flows	205,614
Less imputed interest	(33,915)
Present value of lease liabilities	$ 171,699
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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