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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended				4 Months Ended	9 Months Ended
	Apr. 10, 2024	Jul. 12, 2022	Jul. 31, 2024	Apr. 30, 2024	Jul. 31, 2023	Apr. 30, 2023	Jul. 31, 2024	Jul. 31, 2024
Common Stock
Stockholders' Equity Note
Shares sold during the period			95,220,151	6,463,716	37,931,204	949,438
2022 Open Market Sale Agreement | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC
Stockholders' Equity Note
Percentage of sales commission		2.00%
2022 Open Market Sale Agreement | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | Common Stock
Stockholders' Equity Note
Shares sold during the period			95,200,000
Average sale price per share for sales to date under the amended sales agreement			$ 0.71				$ 0.71	$ 0.71
Gross proceeds from issuance of common stock to date under the amended sales agreement			$ 67.3				$ 67.3	$ 67.3
Common stock issuance, net of fees			65.9
Payments of underwriting discounts and commissions			$ 0.1
2022 Open Market Sale Agreement | Jefferies LLC and Barclays Capital Inc. | Common Stock
Stockholders' Equity Note
Percentage of sales commission	2.00%
Aggregate Offering Price	$ 300.0
2022 Open Market Sale Agreement | Maximum | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | Common Stock
Stockholders' Equity Note
Shares sold during the period		95,000,000.0
Amended Open Market Sales Agreement | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | Common Stock
Stockholders' Equity Note
Shares sold during the period							101,700,000	101,700,000
Aggregate Offering Price	$ 300.0
Average sale price per share for sales to date under the amended sales agreement	$ 0.72		$ 0.72				$ 0.72	$ 0.72
Gross proceeds from issuance of common stock to date under the amended sales agreement	$ 73.6		$ 73.6				$ 73.6	$ 73.6
Common stock issuance, net of fees								71.7
Sales commission	1.5		1.3					1.5
Payments of underwriting discounts and commissions	$ 0.4							0.4
Offering price			$ 226.4				$ 226.4	$ 226.4

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