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Organization - Additional Information (Detail) - USD ($)
$ in Millions
 9 Months Ended
Jan. 31, 2020
Oct. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Restructuring and related activities, description Pending final approval of our Board of Directors, customary regulatory approvals, and tax and legal considerations, the spin-off is expected to be completed in the second half of calendar 2020 and would create two independent publicly traded companies:  
General and Administrative Expenses    
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Costs associated with spin-off $ 1.2  
Minimum    
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Expected restructuring charges 9.0  
Minimum | Scenario Forecast    
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Expected restructuring charges   $ 9.0
Maximum    
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Expected restructuring charges $ 12.0  
Maximum | Scenario Forecast    
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Expected restructuring charges   $ 12.0