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Stock Incentive Plans - Share based payment arrangement restricted stock unit activity (Detail) - Planet Labs Inc [Member] - Restricted Stock Units (RSUs) [Member] - $ / shares	9 Months Ended	12 Months Ended
	Oct. 31, 2021	Jan. 31, 2021	Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs, Beginning Balance	1,085,610	940,930	803,430
Number of RSUs, Vested		0	0
Number of RSUs, Granted	2,531,752	200,000	587,500
Number of RSUs, Forfeited	(132,359)	(55,320)	(450,000)
Number of RSUs, Ending Balance	3,485,003	1,085,610	940,930
Weighted Average Grant Date Fair Value, Beginning Balance	$ 6.091	$ 6.036	$ 5.985
Weighted Average Grant Date Fair Value, Vested		0	0
Weighted Average Grant Date Fair Value, Granted		6.470	6.109
Weighted Average Grant Date Fair Value, Forfeited	7.30	5.984	6.041
Weighted Average Grant Date Fair Value, Ending Balance	$ 11.99	$ 6.091	$ 6.036

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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