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Summary of Significant Accounting Policies - Schedule of Depreciation is computed once an asset is placed in service using the straight-line method over the estimated useful life of the asset (Detail) - Planet Labs Inc [Member]
9 Months Ended 12 Months Ended
Oct. 31, 2021
Jan. 31, 2021
Computer equipment and purchased software    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years 3 years
Office furniture, equipment and fixtures    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 5 years 5 years
Satellites | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 9 years 6 years
Satellites | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 2 years 2 months 12 days 2 years 6 months
Ground stations and ground station equipment    
Property, Plant and Equipment [Line Items]    
Leasehold improvements lesser of useful life orterm of lease  
Ground stations and ground station equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 10 years 10 years
Ground stations and ground station equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years 3 years
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Leasehold improvements   lesser of useful life or term of lease