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Summary of Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
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Dec. 31, 2020 USD ($) shares | Oct. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) shares | Oct. 31, 2020 USD ($) | Jan. 31, 2022 USD ($) | Jan. 31, 2021 USD ($) Day | Jan. 31, 2020 USD ($) Day | Jun. 30, 2021 USD ($) | May 31, 2021 | Mar. 31, 2021 USD ($) | Mar. 09, 2021 USD ($) | Jan. 31, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Federal depository insurance coverage limit | $ 250,000 |  | $ 250,000 |  |  |  |  |  |  |  |  |
Cash equivalents | 0 |  | $ 0 |  |  |  |  |  |  |  |  |
Restricted investments maturity |  |  | 185 days |  |  |  |  |  |  |  |  |
Unrecognized tax benefits | 0 |  | $ 0 |  |  |  |  |  |  |  |  |
Unrecognized tax benefits accrued interest and penalties | 0 |  | 0 |  |  |  |  |  |  |  |  |
Accumulated deficit | (1,400) |  | (52,544,147) |  |  |  |  | $ (45,908,320) |  | $ (45,671,947) | $ (10,757,140) |
Net cash outflows from operations | 0 |  | 3,462,261 |  |  |  |  |  |  |  |  |
Long term debt, Gross | 96,000 |  |  |  |  |  |  |  |  |  |  |
Planet Labs Inc. |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  | $ 5,400,000 |  |  |  | $ 4,714,000 | $ 3,918,000 |  |  |  |  | $ 3,234,000
Unrecognized tax benefits accrued interest and penalties |  | 0 |  |  |  | 0 | 0 |  |  |  |  |
Accumulated deficit |  | (731,064,000) |  |  |  | (639,905,000) | (512,802,000) |  |  |  |  |
Net loss before income tax |  | (90,337,000) |  | $ (89,036,000) |  | (126,030,000) | (123,584,000) |  |  |  |  |
Net cash outflows from operations |  | 21,016,000 |  | 28,096,000 |  | 4,027,000 | 33,687,000 |  |  |  |  |
Cash and cash equivalents at carrying value |  | 58,989,000 |  |  |  | 71,183,000 | 21,678,000 |  |  |  |  |
Long term debt, Gross |  | 174,925,000 |  |  |  | $ 163,856,000 |  |  |  |  |  |
Substantial doubt about going concern, Conditions or Events |  |  |  |  |  | Because the Company has historically generated net losses and negative cash flows from operations, it may be unable to refinance its debt or raise sufficient capital to cause the conversion of its outstanding 2020Convertible Notes into equity securities prior to the springing maturity condition coming into effect. These conditions raise substantial doubt about the Company’s ability to continue as a going concern. |  |  |  |  |  |
Restricted cash |  | 6,100,000 |  |  |  | $ 5,400,000 |  |  |  |  |  |
Restricted cash, current |  | 309,000 |  |  |  | 375,000 | 1,576,000 |  |  |  |  |
Nonfinancial assets, Fair value |  | 0 |  |  |  | 0 | 0 |  |  |  |  |
Concentration risk, Credit risk, Financial instrument, Maximum exposure |  |  |  |  |  | 70,500,000 |  |  |  |  |  |
Depreciation |  | 28,100,000 |  | 38,900,000 |  | 52,700,000 | 69,100,000 |  |  |  |  |
Goodwill impairment |  |  |  |  |  | $ 0 | 0 |  |  |  |  |
Threshold minimum percentage for recognition of tax benefit |  |  |  |  |  | 50.00% |  |  |  |  |  |
Foreign currency gain loss for the period |  |  |  |  |  | $ 300,000 | $ 300,000 |  |  |  |  |
Number of reportable segments | Day |  |  |  |  |  | 1 | 1 |  |  |  |  |
Decrease in depreciation expense |  | 13,700,000 |  |  |  |  |  |  |  |  |  |
Decrease in basic and diluted net loss per share attributable to common stockholders |  | 450,000 |  |  |  |  |  |  |  |  |  |
Deferred offering costs capitalized within other assets |  | 6,300,000 |  |  |  |  |  |  |  |  |  |
Planet Labs Inc. | Satellites [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  | $ 24,500,000 |  | $ 34,000,000.0 |  | $ 44,200,000 | $ 58,600,000 |  |  |  |  |
Planet Labs Inc. | Satellites [Member] | Retired Satellites [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  | $ 700,000 | $ 2,500,000 |  |  |  |  |
Planet Labs Inc. | Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  | 10.00% |  | 10.00% |  | 10.00% | 10.00% |  |  |  |  |
Planet Labs Inc. | Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 12.00% | 13.00% |  |  |  |  |
Planet Labs Inc. | Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 10.00% |  |  |  |  |  |
Planet Labs Inc. | Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer Three [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 10.00% |  |  |  |  |  |
Planet Labs Inc. | Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 32.00% | 50.00% |  |  |  |  |
Planet Labs Inc. | Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 18.00% |  |  |  |  |  |
Planet Labs Inc. | Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Three [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 12.00% |  |  |  |  |  |
Planet Labs Inc. | Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  | $ 300,000 |  |  |  | $ 400,000 | $ 1,600,000 |  |  |  |  |
Planet Labs Inc. | Money Market Funds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | 4,200,000 |  |  |  | 4,300,000 |  |  |  |  |  |
Planet Labs Inc. | Deposits [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | 300,000 |  |  |  | 200,000 |  |  |  |  |  |
Planet Labs Inc. | Performance Guarantees Required For The Foreign Sales Activities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | 1,600,000 |  |  |  | 900,000 |  |  |  |  |  |
Planet Labs Inc. | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expected decrease in depreciation expense |  |  |  |  | $ 17,600,000 |  |  |  |  |  |  |
Planet Labs Inc. | Subsequent Event [Member] | Amended LOI [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, Percentage of voting interests acquired |  |  |  |  |  |  |  |  | 100.00% |  |  |
Planet Labs Inc. | Two Thousand And Twenty Convertible Notes And Venture Tranche B [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, Gross |  | 77,100,000 |  |  |  | 77,100,000 |  |  |  |  |  |
Planet Labs Inc. | Two Thousand And Twenty Convertible Notes [Member] | Matures June Twenty Two Two Thousand And Twenty Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, Gross |  | 71,100,000 |  |  |  | 71,100,000 |  |  |  |  |  |
Planet Labs Inc. | Venture Tranche B [Member] | No Stated Maturity Date [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, Gross |  | $ 6,000,000.0 |  |  |  | $ 6,000,000.0 |  |  |  |  |  |
Planet Labs Inc. | SVB Hercules Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, Maturity date, Description |  | The SVB and Hercules Loan also contained a “springing maturity” provision, which accelerates the maturity date for repayment of the loan, including interest and fees to March 23, 2022, if the outstanding 2020 Convertible Notes did not convert into equity securities by such date. |  |  |  | The SVB and Hercules Loan also contains a “springing maturity” provision, which accelerates the maturity date for repayment of the loan, including interest and fees to March 23, 2022, if the outstanding 2020 Convertible Notes have not converted into equity securities by such date. |  |  |  |  |  |
Planet Labs Inc. | SVB Hercules Loan [Member] | Matures June Twenty One Two Thousand And Twenty Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, Gross |  | $ 67,000,000.0 |  |  |  | $ 67,000,000.0 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public Shares redeemable amount limit of net tangible assets | $ 5,000,001 |  | $ 5,000,001 |  |  |  |  |  |  |  |  |
Class A Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock subject to possible redemption | shares | 0 |  | 34,500,000 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  | 12,833,333 |  |  |  |  |  |  |  |  |
Class B Shares [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares subject to forfeiture | shares | 1,125,000 |  |  |  |  |  |  |  |  |  |  |

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