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Loss Per Share - Calculation of Basic and Diluted Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Aug. 15, 2019
May 15, 2019
Oct. 31, 2022
Oct. 31, 2021
Oct. 31, 2020
Numerator          
Net loss attributable to FuelCell Energy, Inc.     $ (142,722) $ (101,055) $ (89,107)
Preferred dividends - Series B     (3,200) (3,200) (3,331)
Net loss attributable to common stockholders     $ (145,922) $ (104,255) $ (92,438)
Denominator          
Weighted average common shares outstanding - basic     383,139,140 334,742,346 221,960,288
Weighted average common shares outstanding - diluted     383,139,140 334,742,346 221,960,288
Net loss to common stockholders per share - basic     $ (0.38) $ (0.31) $ (0.42)
Net loss to common stockholders per share - diluted     $ (0.38) $ (0.31) $ (0.42)
Series B Preferred Stock          
Numerator          
Preferred dividends - Series B $ 0 $ 0 $ (3,200) $ (3,200) $ (3,331)