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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 9 Months Ended
Jul. 31, 2024
Jul. 31, 2023
Jul. 31, 2024
Jul. 31, 2023
Numerator        
Net loss attributable to FuelCell Energy, Inc. $ (32,660) $ (24,279) $ (84,593) $ (77,204)
Series B preferred stock dividends (800) (800) (2,400) (2,400)
Net loss attributable to common stockholders $ (33,460) $ (25,079) $ (86,993) $ (79,604)
Denominator        
Weighted average common shares outstanding - basic 503,183,725 415,867,594 469,387,264 409,361,826
Weighted average common shares outstanding - diluted 503,183,725 415,867,594 469,387,264 409,361,826
Net loss to common stockholders per share - basic $ (0.07) $ (0.06) $ (0.19) $ (0.19)
Net loss to common stockholders per share - diluted $ (0.07) $ (0.06) $ (0.19) $ (0.19)
Series B Preferred Stock        
Numerator        
Series B preferred stock dividends $ (800) $ (800) $ (2,400) $ (2,400)