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Preferred Stock - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Oct. 31, 2021
Sep. 30, 2021
Jan. 31, 2021
Jan. 31, 2020
Class of Stock [Line Items]          
Preferred stock, shares authorized 1,000,000   1,000,000 105,000,000  
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]          
Class of Stock [Line Items]          
Preferred stock, shares authorized   105,000,000   105,000,000 105,000,000
Preferred stock dividend rate       $ 0  
Preferred stock convertible conversion price       $ 14.3754  
Gross Offering Proceeds From Conversion Of Preferred Stock       $ 150  
Preferred stock voting rights       nine  
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.  
Founders [Member] | Planet Labs Inc [Member]          
Class of Stock [Line Items]          
Preferred stock voting rights       five  
Board Of Directors [Member] | Planet Labs Inc [Member]          
Class of Stock [Line Items]          
Preferred stock voting rights       one  
Founder Common Directors [Member] | Planet Labs Inc [Member]          
Class of Stock [Line Items]          
Preferred stock voting rights       two  
Series A Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred stock, shares authorized       30,000,000  
Preferred stock per share liquidation preferrence       $ 0.7871  
Series A Preferred Stock [Member] | Planet Labs Inc [Member]          
Class of Stock [Line Items]          
Preferred stock, shares authorized   30,000,000      
Preferred stock dividend rate       0.062970  
Preferred stock convertible conversion price       0.7871  
Preferred stock per share liquidation preferrence   $ 0.79   0.7871  
Preferred stock dividend received per share       $ 0.7871  
Series B Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred stock, shares authorized       15,000,000  
Preferred stock per share liquidation preferrence       $ 5.0301  
Series B Preferred Stock [Member] | Planet Labs Inc [Member]          
Class of Stock [Line Items]          
Preferred stock, shares authorized   15,000,000      
Preferred stock dividend rate       0.402405  
Preferred stock convertible conversion price       5.0301  
Preferred stock per share liquidation preferrence   $ 5.03   5.0301  
Preferred stock dividend received per share       $ 5.0301  
Series C Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred stock, shares authorized       14,436,335  
Preferred stock per share liquidation preferrence       $ 9.1989  
Series C Preferred Stock [Member] | Planet Labs Inc [Member]          
Class of Stock [Line Items]          
Preferred stock, shares authorized   14,436,335      
Preferred stock dividend rate       0.735914  
Preferred stock convertible conversion price       9.1989  
Preferred stock per share liquidation preferrence   $ 9.20   9.1989  
Preferred stock dividend received per share       $ 9.1989  
Series D Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred stock, shares authorized       40,000,000  
Preferred stock per share liquidation preferrence       $ 14.3754  
Series D Preferred Stock [Member] | Planet Labs Inc [Member]          
Class of Stock [Line Items]          
Preferred stock, shares authorized   40,000,000      
Preferred stock dividend rate       1.150035  
Preferred stock convertible conversion price       14.3754  
Preferred stock per share liquidation preferrence   $ 14.38   14.3754  
Preferred stock dividend received per share       $ 14.3754  
Series C Prime Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred stock, shares authorized       5,563,665  
Preferred stock per share liquidation preferrence       $ 11.0387  
Series C Prime Preferred Stock [Member] | Planet Labs Inc [Member]          
Class of Stock [Line Items]          
Preferred stock, shares authorized   5,563,665      
Preferred stock dividend rate       0.883096  
Preferred stock convertible conversion price       11.0387  
Preferred stock per share liquidation preferrence   $ 11.04   11.0387  
Preferred stock dividend received per share       $ 11.0387  
Common Class B [Member] | Planet Labs Inc [Member]          
Class of Stock [Line Items]          
Common Stock, Voting Rights   10 votes for each share   10  
Common Class B [Member] | Founders [Member] | Planet Labs Inc [Member]          
Class of Stock [Line Items]          
Common Stock, Voting Rights       10