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Loss Per Share - Schedule of Calculation of Basic and Diluted Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2022
Numerator      
Net loss attributable to FuelCell Energy, Inc. $ (126,009) $ (107,568) $ (142,722)
Series B preferred stock dividends (3,200) (3,200) (3,200)
Net loss attributable to common stockholders $ (129,209) $ (110,768) $ (145,922)
Denominator      
Weighted average common shares outstanding - basic 16,505,257 13,991,593 12,771,305
Weighted average common shares outstanding - diluted 16,505,257 13,991,593 12,771,305
Net loss to common stockholders per share - basic $ (7.83) $ (7.92) $ (11.43)
Net loss to common stockholders per share - diluted $ (7.83) $ (7.92) $ (11.43)
Series B Preferred Stock      
Numerator      
Series B preferred stock dividends $ (3,200) $ (3,200) $ (3,200)