Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Parenthetical) (Details) $ in Millions	Apr. 30, 2021 USD ($)
Leases [Abstract]
Non-cancellable sublease proceeds for the year ending January 31, 2022	$ 6.6
Non-cancellable sublease proceeds for the year ending January 31, 2023	8.8
Non-cancellable sublease proceeds for the year ending January 31, 2024	2.3
Non-cancellable sublease proceeds for the year ending January 31, 2025	$ 2.1