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Income Taxes - Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Deferred Tax Assets, Valuation Allowance [Roll Forward]      
Beginning balance $ 445,746 $ 282,141 $ 119,153
Valuation allowance charged to income tax provision 269,135 163,605 201,646
Valuation allowance from acquisitions 9,354 0 0
Convertible senior notes settled 14,985 0 0
Convertible senior notes issued (15,453) 0 (31,594)
Acquisition of SpringCM 0 0 (7,064)
Ending balance $ 723,767 $ 445,746 $ 282,141