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Stockholders' Equity and Warrant Liabilities - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		2 Months Ended	3 Months Ended		8 Months Ended
	Jun. 11, 2021	Jul. 31, 2021	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022
Series C Warrants
Stockholders' Equity Note
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 19.20		$ 19.20
Class of warrant or right term			5 years
Common Stock
Stockholders' Equity Note
Stock issued during period shares new issues				25,000,000
At Market Issuance Sales Agreement | Jefferies LLC | Common Stock
Stockholders' Equity Note
Stock issued during period shares new issues		44,100,000	0		44,100,000
Net proceeds from issuance of common stock	$ 377.2	$ 369.7	$ 377.2		$ 369.7
Aggregate Offering Price	$ 500.0
Percentage Of Sales Commission	2.00%
Average Sale Of Stock Price Per Share			$ 8.56		$ 8.56
Gross Proceeds From Issuance Of Common Stock					$ 377.2
Payments of commissions and offering expenses	$ 7.5
Sale agreement, common stock, value, available for issuance	122.8		$ 122.8		$ 122.8
At Market Issuance Sales Agreement | Maximum | Jefferies LLC | Common Stock
Stockholders' Equity Note
Aggregate Offering Price	$ 500.0

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