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Operating Leases - Additional Information (Details)
$ in Millions
12 Months Ended
Jan. 31, 2021
USD ($)
lease
Jan. 31, 2020
USD ($)
Jan. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]      
Number of operating lease options | lease 1    
Operating lease expense $ 14.5 $ 9.7  
Rent expense     $ 7.2
Maximum      
Lessee, Lease, Description [Line Items]      
Lease contractual period 9 years