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Common Stock - Additional Information (Detail) $ in Thousands |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 04, 2021 | Aug. 12, 2019 | Dec. 31, 2020 | Oct. 31, 2021 USD ($) | Sep. 30, 2021 | Jan. 31, 2021 USD ($)
Common Stock, Voting Rights |  |  | Stockholders of record are entitled to one vote for each share held on all matters to be voted on by stockholders. Holders of Class A common stock and holders of Class B common stock will vote together as a single class on all matters submitted to a vote of our stockholders except as required by law. |  | Stockholders of record are entitled to one vote for each share held on all matters to be voted on by stockholders. Holders of Class A common stock and holders of Class B common stock will vote together as a single class on all matters submitted to a vote of the stockholders except as required by law. |
Planet Labs Inc [Member] |  |  |  |  |  |
Common Stock, Voting Rights |  |  |  | The holders of the Class A Common Stock and the holders of the Class B Common Stock at all times vote together as one class on all matters. |  | The holders of the Class A Common Stock and the holders of the Class B Common Stock at all times vote together as one class on all matters.
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 5 |  |  |  |
Dividend Declared [Member] | Planet Labs Inc [Member] |  |  |  |  |  |
Dividends, Common Stock |  |  |  | $ 0 |  | $ 0
Common Class A [Member] | Planet Labs Inc [Member] |  |  |  |  |  |
Common Stock, Voting Rights |  |  |  | 1 vote for each share |  | 1
Common Class B [Member] |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 1.2 |  |  |  |  |
Common Class B [Member] | Planet Labs Inc [Member] |  |  |  |  |  |
Common Stock, Voting Rights |  |  |  | 10 votes for each share |  | 10

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