Commitments and Contingencies - Additional Information (Details) - USD ($)					3 Months Ended
	Oct. 31, 2020	Sep. 14, 2020	Jun. 28, 2020	Apr. 27, 2020	Jan. 31, 2021
Commitments And Contingencies [Line Items]
Recorded unconditional purchase obligation					$ 64,400,000
Loss contingency, damages sought	$ 880,000,000
Accounts receivable outstanding					$ 6,400,000
Posco Energy [Member]
Commitments And Contingencies [Line Items]
Loss contingency, damages sought			$ 200,000,000	$ 3,300,000
Unspecified warranty claims				7
License termination				$ 110,000,000
Loss contingency, claimed Loss		$ 1,000,000