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Loss Per Share - Schedule of Calculation of Basic and Diluted Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jan. 31, 2025
Jan. 31, 2024
Numerator    
Net loss attributable to FuelCell Energy, Inc. $ (28,326) $ (19,793)
Series B preferred stock dividends (800) (800)
Net loss attributable to common stockholders $ (29,126) $ (20,593)
Denominator    
Weighted average common shares outstanding - basic 20,501,663 15,054,568
Weighted average common shares outstanding - diluted 20,501,663 15,054,568
Net loss to common stockholders per share - basic $ (1.42) $ (1.37)
Net loss to common stockholders per share - diluted $ (1.42) $ (1.37)
Series B Preferred Stock    
Numerator    
Series B preferred stock dividends $ (800) $ (800)