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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
Apr. 30, 2022
Jan. 31, 2022
Apr. 30, 2021
Jan. 31, 2021
Apr. 30, 2022
Apr. 30, 2021
Numerator            
Net loss attributable to FuelCell Energy, Inc. $ (30,217)   $ (18,917)   $ (70,841) $ (64,877)
Preferred dividends - Series B (800) $ (800) (800) $ (800)    
Net loss attributable to common stockholders $ (31,017)   $ (19,717)   $ (72,441) $ (66,477)
Denominator            
Weighted average common shares outstanding - basic 372,615,824   322,500,592   369,626,543 317,219,129
Weighted average common shares outstanding - diluted 372,615,824   322,500,592   369,626,543 317,219,129
Net loss to common stockholders per share - basic $ (0.08)   $ (0.06)   $ (0.20) $ (0.21)
Net loss to common stockholders per share - diluted $ (0.08)   $ (0.06)   $ (0.20) $ (0.21)
Series B Preferred Stock            
Numerator            
Preferred dividends - Series B $ (800)   $ (800)   $ (1,600) $ (1,600)