Debt, Convertible Notes, and Warrants - Summary of Interest Expense (Detail) - Planet Labs Inc. - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Debt Instruments [Line Items]
Contractual interest coupon	$ 5,422	$ 4,869	$ 6,697	$ 5,554
Amortization of debt issuance costs	679	583	811	402
Amortization of debt discounts	1,649	1,383	1,939	990
Debt extinguishment (gain) loss	0	(673)	(673)	11,529
Total interest expense and extinguishment (gain) loss	$ 7,750	$ 6,162	$ 8,774	$ 18,475

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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