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Debt - Schedule of Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Debt Disclosure [Abstract]        
Contractual interest expense $ 3,174 $ 4,799 $ 6,322 $ 7,430
Interest cost related to amortization of debt discount 101 13,665 202 27,620
Interest cost related to amortization of debt issuance costs 896 863 1,792 1,750
Total interest expense $ 4,171 $ 19,327 $ 8,316 $ 36,800