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Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Parenthetical) (Details)
$ in Millions
Apr. 30, 2020
USD ($)
Leases [Abstract]  
Non-cancellable sublease proceeds for the year ending January 31, 2021 $ 6.7
Non-cancellable sublease proceeds for the year ending January 31, 2022 9.1
Non-cancellable sublease proceeds for the year ending January 31, 2023 8.3
Non-cancellable sublease proceeds for the year ending January 31, 2024 2.2
Non-cancellable sublease proceeds for the year ending January 31, 2025 $ 2.2