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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 |  |  |  |  |

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