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Loss Per Share - Calculation of Basic and Diluted Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2023
Jan. 31, 2023
Apr. 30, 2022
Jan. 31, 2022
Apr. 30, 2023
Apr. 30, 2022
Oct. 31, 2022
Numerator              
Net loss attributable to FuelCell Energy, Inc. $ (34,303)   $ (30,217)   $ (52,925) $ (70,841)  
Series B preferred stock dividends (800) $ (800) (800) $ (800) (1,600) (1,600)  
Net loss attributable to common stockholders $ (35,103)   $ (31,017)   $ (54,525) $ (72,441)  
Denominator              
Weighted average common shares outstanding - basic 406,316,070   372,615,824   406,055,027 369,626,543 369,626,543
Weighted average common shares outstanding - diluted 406,316,070   372,615,824   406,055,027 369,626,543 369,626,543
Net loss to common stockholders per share - basic $ (0.09)   $ (0.08)   $ (0.13) $ (0.20) $ (0.20)
Net loss to common stockholders per share - diluted $ (0.09)   $ (0.08)   $ (0.13) $ (0.20) $ (0.20)
Series B Preferred Stock              
Numerator              
Series B preferred stock dividends $ (800)   $ (800)   $ (1,600) $ (1,600)