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Leases - Schedule of Future Minimum Operating Lease Payments Due Under ASC 842 (Detail)
$ in Millions
Apr. 30, 2020
USD ($)
Leases [Abstract]  
Remaining six months of fiscal year 2020 $ 4.7
2021 8.6
2022 6.9
2023 4.2
2024 2.4
Thereafter 3.8
Total undiscounted lease payments 30.6
Less: imputed interest (2.5)
Total lease liabilities $ 28.1