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Related Party Transactions - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 28, 2021
USD ($)
Mar. 09, 2021
$ / shares
shares
Mar. 04, 2021
shares
Jan. 01, 2021
USD ($)
Dec. 15, 2020
USD ($)
$ / shares
shares
Aug. 12, 2019
Feb. 28, 2021
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Oct. 31, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Oct. 31, 2020
USD ($)
Jan. 31, 2021
USD ($)
$ / shares
shares
Jan. 31, 2020
USD ($)
$ / shares
shares
Jan. 31, 2018
Aug. 31, 2021
USD ($)
Aug. 18, 2020
$ / shares
Mar. 31, 2020
USD ($)
shares
Related Party Transaction [Line Items]                                    
Initial Public Offering, units | shares   34,500,000           34,500,000                    
Initial Public Offering, price per unit | $ / shares   $ 10.00                                
Initial Public Offering, gross proceeds                     $ 8,900,000              
Warrants exercise price per share | $ / shares               $ 11.50                    
Repayments of Notes Payable                     991,000              
Common stock, shares outstanding | shares     8,625,000                              
Stock Issued During Period, Value, Issued for Services [1],[2]               $ 25,000                    
Proceeds from Related Party Debt                     362,292              
Over-Allotment Option [Member]                                    
Related Party Transaction [Line Items]                                    
Initial Public Offering, units | shares   4,500,000           4,500,000                    
Initial Public Offering, price per unit | $ / shares   $ 11.50           $ 11.50                    
Founder Shares [Member]                                    
Related Party Transaction [Line Items]                                    
Initial stockholders agreed to forfeit | shares         1,125,000                          
Percentage of founder shares from related party         20.00%                          
Common stock that were subject to forfeiture | shares   1,125,000                                
Founder Shares [Member] | Darla Anderson [Member]                                    
Related Party Transaction [Line Items]                                    
Shares transferred during the period | shares             25,000                      
Founder Shares [Member] | Francesca Luthi [Member]                                    
Related Party Transaction [Line Items]                                    
Shares transferred during the period | shares             25,000                      
Founder Shares [Member] | Charles E Wert [Member]                                    
Related Party Transaction [Line Items]                                    
Shares transferred during the period | shares             25,000                      
Sponsor [Member]                                    
Related Party Transaction [Line Items]                                    
Proceeds from notes payable to related party current                     200,000              
Advances received from related parties                 $ 791,000   791,000         $ 37,000    
Sponsor [Member] | Subsequent Event [Member]                                    
Related Party Transaction [Line Items]                                    
Advances received from related parties                               $ 37,000    
Sponsor [Member] | Maximum [Member]                                    
Related Party Transaction [Line Items]                                    
Proceeds from notes payable to related party current               $ 200,000     $ 200,000              
Related Party Loans [Member]                                    
Related Party Transaction [Line Items]                                    
Convertible price warrants for post business combination entity | $ / shares               $ 1.50     $ 1.50              
Related Party Loans [Member] | Maximum [Member]                                    
Related Party Transaction [Line Items]                                    
Proceeds from Promissory Note to related party                     $ 791,000              
Working Capital Loans               $ 1,500,000     1,500,000              
Administrative Service Agreement [Member]                                    
Related Party Transaction [Line Items]                                    
Monthly charge for administrative services               10,000     10,000              
Related party transaction, selling, general and administrative expenses from transactions with related party                 $ 30,000   70,000              
Promissory Note [Member]                                    
Related Party Transaction [Line Items]                                    
Proceeds from Related Party Debt       $ 96,000       $ 750     $ 200,000              
Private Placement Warrant [Member]                                    
Related Party Transaction [Line Items]                                    
Initial Public Offering, units | shares               5,333,333     5,933,333              
Initial Public Offering, price per unit | $ / shares               $ 1.50 $ 1.50   $ 1.50              
Initial Public Offering, gross proceeds               $ 8,000,000.0     $ 8,900,000              
Private Placement Warrant [Member] | Over-Allotment Option [Member]                                    
Related Party Transaction [Line Items]                                    
Initial Public Offering, units | shares               5,933,333                    
Initial Public Offering, gross proceeds               $ 8,900,000                    
Common Class A [Member]                                    
Related Party Transaction [Line Items]                                    
Common stock, par value | $ / shares               $ 0.0001 $ 0.0001   $ 0.0001              
Warrants exercise price per share | $ / shares                                 $ 11.50  
Common stock, shares outstanding | shares               0                    
Class of warrant or right, Number of securities called by warrants or rights | shares                 12,833,333   12,833,333              
Common Class A [Member] | Founder Shares [Member]                                    
Related Party Transaction [Line Items]                                    
Closing Share Threshold Price | $ / shares         $ 12.00                          
Common Class A [Member] | Private Placement Warrant [Member]                                    
Related Party Transaction [Line Items]                                    
Warrants exercise price per share | $ / shares                 $ 11.50   $ 11.50              
Common Class B [Member]                                    
Related Party Transaction [Line Items]                                    
Common stock, par value | $ / shares               $ 0.0001 $ 0.0001   $ 0.0001              
Common stock, shares outstanding | shares     8,625,000         8,625,000 8,625,000   8,625,000              
Stockholders' Equity Note, Stock Split, Conversion Ratio     1.2                              
Common Class B [Member] | Subsequent Event [Member]                                    
Related Party Transaction [Line Items]                                    
Common stock, shares outstanding | shares     8,625,000                              
Common Class B [Member] | Over-Allotment Option [Member]                                    
Related Party Transaction [Line Items]                                    
Common stock that were subject to forfeiture | shares               1,125,000                    
Common Class B [Member] | Founder Shares [Member]                                    
Related Party Transaction [Line Items]                                    
Common stock, par value | $ / shares         $ 0.0001                          
Common Class B [Member] | Sponsor [Member]                                    
Related Party Transaction [Line Items]                                    
Issuance of Class B common stock to Sponsor (in shares) | shares         7,187,500                          
Stock Issued During Period, Value, Issued for Services         $ 25,000                          
Stockholders' Equity Note, Stock Split, Conversion Ratio     1.2                              
Planet Labs Inc [Member]                                    
Related Party Transaction [Line Items]                                    
Repayments of Notes Payable                   $ 0   $ 2,586,000 $ 2,586,000          
Stockholders' Equity Note, Stock Split, Conversion Ratio           5                        
Debt instrument, Face amount                   $ 6,035,000     $ 6,035,000          
Planet Labs Inc [Member] | Amended Terms Of Hosting Agreement [Member]                                    
Related Party Transaction [Line Items]                                    
Increase In Aggregate Purchase Commitment Amount $ 193,000,000.0                                  
Planet Labs Inc [Member] | Google [Member] | Amended Terms Of Hosting Agreement [Member]                                    
Related Party Transaction [Line Items]                                    
Amendment agreement commencement date Aug. 01, 2021                                  
Amendment agreement extended date Jan. 31, 2028                                  
Planet Labs Inc [Member] | Minimum [Member] | Google [Member]                                    
Related Party Transaction [Line Items]                                    
Equity method investment, Ownership percentage                   10.00%     10.00%          
Planet Labs Inc [Member] | Two Thousand And Twenty Convertible Notes [Member] | Convertible Debt Current [Member]                                    
Related Party Transaction [Line Items]                                    
Notes payable related parties current                   $ 11,000,000.0                
Planet Labs Inc [Member] | Two Thousand And Twenty Convertible Notes [Member] | Google [Member]                                    
Related Party Transaction [Line Items]                                    
Debt instrument, Face amount                                   $ 10,000,000.0
Planet Labs Inc [Member] | Two Thousand And Twenty Convertible Notes [Member] | Google [Member] | Convertible Debt Noncurrent [Member]                                    
Related Party Transaction [Line Items]                                    
Notes payable, Related parties, Noncurrent                         $ 10,500,000          
Planet Labs Inc [Member] | Content License Agreement [Member] | Google [Member]                                    
Related Party Transaction [Line Items]                                    
Related party transaction, Term                             5 years      
Related Party Transaction, Terms and Manner of Settlement                             The contract automatically renews for one additional year if the parties fail to fulfill their respective obligations at the end of year 5.      
Related party transaction, Deferred revenue                   15,200,000     20,800,000 $ 32,300,000        
Revenue from related parties                   5,600,000   9,500,000 11,500,000 8,100,000        
Planet Labs Inc [Member] | Hosting And Service Arrangement [Member] | Google [Member]                                    
Related Party Transaction [Line Items]                                    
Related party transaction, Deferred cost                   17,000,000.0     10,300,000          
Related party transaction, Expenses from transactions with related party                   13,700,000   $ 9,500,000 13,100,000 10,900,000        
Accounts payable, Related parties, Current                   $ 1,900,000     $ 0 $ 1,000,000.0        
Planet Labs Inc [Member] | Common Class A [Member]                                    
Related Party Transaction [Line Items]                                    
Common stock, par value | $ / shares                   $ 0.00002     $ 0.00002 $ 0.00002        
Common stock, shares outstanding | shares                   17,625,967     14,876,627 13,785,927        
Planet Labs Inc [Member] | Common Class B [Member]                                    
Related Party Transaction [Line Items]                                    
Common stock, par value | $ / shares                   $ 0.00002     $ 0.00002 $ 0.00002        
Common stock, shares outstanding | shares                   13,811,878     13,811,878 13,811,878        
Planet Labs Inc [Member] | Series D Preferred Stock [Member] | Google [Member]                                    
Related Party Transaction [Line Items]                                    
Shares, Outstanding | shares                   18,633,305     18,633,305          
Planet Labs Inc [Member] | Series D Preferred Stock [Member] | Two Thousand And Twenty Convertible Notes [Member] | Google [Member]                                    
Related Party Transaction [Line Items]                                    
Class of warrant or right, Number of securities called by warrants or rights | shares                                   139,126
[1] On March 4, 2021, the Company effected a 1:1.2 stock split of Class B common stock, resulting in an aggregate of 8,625,000 shares of Class B common stock outstanding. All shares and associated amounts have been retroactively restated to reflect the stock split (see Note 4).
[2] This number includes up to 1,125,000 shares of Class B common stock subject to forfeiture if the over-allotment option is not exercised in full or in part by the underwriters (see Note 4).