Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 31, 2023	Oct. 31, 2022
Revenues:
Total revenues	$ 37,073	$ 31,795
Total costs of revenues
Total costs of revenues	31,836	34,690
Gross profit (loss)	5,237	(2,895)
Operating expenses:
Administrative and selling expenses	15,009	36,965
Research and development expenses	12,683	4,984
Total costs and expenses	27,692	41,949
Loss from operations	(22,455)	(44,844)
Interest expense	(1,512)	(1,428)
Interest income	3,410	10
Other income, net	49	142
Loss before provision for income taxes	(20,508)	(46,120)
Provision for income taxes	(578)
Net loss	(21,086)	(46,120)
Net loss attributable to noncontrolling interests	(2,464)	(5,496)
Net loss attributable to FuelCell Energy, Inc.	(18,622)	(40,624)
Series B preferred stock dividends	(800)	(800)
Net loss attributable to common stockholders	$ (19,422)	$ (41,424)
Loss per share basic and diluted:
Net loss per share attributable to common stockholders, basic	$ (0.05)	$ (0.11)
Net loss per share attributable to common stockholders, diluted	$ (0.05)	$ (0.11)
Basic weighted average shares outstanding	405,803,753	366,734,739
Diluted weighted average shares outstanding	405,803,753	366,734,739
Net loss	$ (21,086)	$ (46,120)
Other comprehensive loss:
Foreign currency translation adjustments	447	(91)
Total comprehensive loss	(20,639)	(46,211)
Comprehensive loss attributable to noncontrolling interests	(2,464)	(5,496)
Comprehensive loss attributable to FuelCell Energy, Inc.	(18,175)	(40,715)
Series B Preferred Stock
Operating expenses:
Series B preferred stock dividends	(800)
Product
Revenues:
Total revenues	9,095	18,000
Total costs of revenues
Total costs of revenues	1,029	18,207
Service
Revenues:
Total revenues	13,882	2,167
Total costs of revenues
Total costs of revenues	10,945	2,372
Generation
Revenues:
Total revenues	9,557	7,496
Total costs of revenues
Total costs of revenues	16,602	10,722
Advanced Technologies
Revenues:
Total revenues	4,539	4,132
Total costs of revenues
Total costs of revenues	$ 3,260	$ 3,389