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Income Taxes - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Jan. 31, 2019
Unrecognized tax benefits, Income tax penalties and Interest accrued |  |  |  |  | $ 0 | $ 0 |
Gross unrecognized tax benefits |  |  |  |  | $ 0 | $ 0 |
Planet Labs Inc [Member] |  |  |  |  |  |  |
Deferred tax assets, Gross |  |  | $ 131,126,000 | $ 114,906,000 |  |  |
Undistributed earnings of foreign subsidiaries |  |  | $ 1,400,000 |  |  |  |
Deferred tax liability not recognized, Determination of deferred tax liability is not practicable, Undistributed earnings of foreign subsidiaries |  |  | the corresponding unrecognized deferred U.S. income tax liability is not material |  |  |  |
Operating loss carryforwards, Expiration, Beginning term |  |  | 2022 |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  | $ 0 |  |  |  |
Unrecognized tax benefits, Income tax penalties and Interest accrued | $ 0 |  | 0 | 0 |  |  |
Unrecognized tax benefits, Income tax penalties and Interest expense | 0 |  | 0 | 0 |  |  |
Income tax expense | $ 822,000 | $ 569,000 | 1,073,000 | 130,000 |  |  |
Income tax examination descrption | All tax years remain open to examination by taxing jurisdictions to which the Company is subject. |  |  |  |  |  |
Gross unrecognized tax benefits | $ 5,400,000 |  | 4,714,000 | $ 3,918,000 |  |  | $ 3,234,000
Planet Labs Inc [Member] | Domestic Tax Authority [Member] |  |  |  |  |  |  |
Operating loss carryforwards |  |  | 384,800,000 |  |  |  |
Planet Labs Inc [Member] | Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member] |  |  |  |  |  |  |
Tax credit carryforward, Amount |  |  | $ 13,700,000 |  |  |  |
Tax credit carryforward, Expiration, Beginning term |  |  | 2032 |  |  |  |
Planet Labs Inc [Member] | State and Local Jurisdiction [Member] |  |  |  |  |  |  |
Operating loss carryforwards |  |  | $ 163,200,000 |  |  |  |
Planet Labs Inc [Member] | State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member] | California Franchise Tax Board [Member] |  |  |  |  |  |  |
Tax credit carryforward, Amount |  |  | 9,800,000 |  |  |  |
Planet Labs Inc [Member] | Foreign Tax Authority [Member] |  |  |  |  |  |  |
Operating loss carryforwards |  |  | $ 1,300,000 |  |  |  |

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