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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Mar. 09, 2021
Dec. 31, 2020
Oct. 31, 2021
Sep. 30, 2021
Oct. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Underwriting discount   $ 0.20   $ 0.20      
Underwriting discount aggregate amount   $ 6,000,000.0   $ 6,900,000      
Additional fee per unit   $ 0.35   $ 0.35      
Deferred underwriting commissions in connection with the initial public offering   $ 10,500,000   $ 12,100,000      
Stock Issued During Period, Shares, New Issues 34,500,000 34,500,000          
Planet Labs Inc [Member]              
Lessee, operating lease, description     The Company leases office space under various noncancelable operating leases with varying lease expiration dates through 2024.     The Company leases office space under various noncancelable operating leases with varying lease expiration dates through 2024.  
Lessee, operating lease, option to extend     Certain leases contain renewal options for the Company to extend the lease term and escalation clauses.     Certain leases contain renewal options for the Company to extend the lease term and escalation clauses.  
Operating leases, Rent expense, Sublease rentals     $ 200,000   $ 700,000 $ 1,300,000 $ 1,300,000
Operating leases, Rent expense, Net     $ 2,300,000   $ 2,200,000 3,000,000.0 $ 3,800,000
Planet Labs Inc [Member] | Indemnification Agreement [Member]              
Litigation settlement, Expense           0  
Loss contingency accrual           $ 0  
Planet Labs Inc [Member] | Hosting Services [Member]              
Minimum purchase commitment, End date     Jan. 31, 2028     Feb. 19, 2027  
Over-Allotment Option [Member]              
Underwriting discount aggregate amount   $ 6,900,000          
Deferred underwriting commissions in connection with the initial public offering   $ 12,100,000          
Stock Issued During Period, Shares, New Issues 4,500,000 4,500,000