Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Oct. 31, 2014		Oct. 31, 2013		Oct. 31, 2012
Revenues:
Product sales (including $115.0 million, $81.6 million and $83.9 million of related party revenue)	$ 136,842		$ 145,071		$ 94,950
Service agreements and license revenues (including $14.9 million, $20.1 milion and $8.4 million of related party revenue)	25,956		28,141		18,183
Advanced technologies contract revenues (including $0.4 million, $0.3 million and $0.2 million of related party revenue)	17,495		14,446		7,470
Total revenues	180,293		187,658		120,603
Costs of revenues:
Cost of product sales	126,866		136,989		93,876
Cost of Services	23,037		29,683		19,045
Cost of advanced technologies contract revenues	16,664		13,864		7,237
Total costs of revenues	166,567		180,536		120,158
Gross profit	13,726		7,122		445
Operating expenses:
Administrative and selling expenses	22,797		21,218		18,220
Research and development expenses	18,240		15,717		14,354
Total operating expenses	41,037		36,935		32,574
Loss from operations	(27,311)		(29,813)		(32,129)
Interest expense	(3,561)		(3,973)		(2,304)
Income (loss) from equity investment	0		46		(645)
Impairment of equity Investment	0		0		(3,602)
License fee and royalty income	0		0		1,599
Other income (expense), net	(7,523)		(1,208)		1,244
Loss before provision for income taxes	(38,395)		(34,948)		(35,837)
Provision for income taxes	(488)		(371)		(69)
Net loss	(38,883)		(35,319)		(35,906)
Net loss attributable to noncontrolling interest	758		961		411
Net loss attributable to FuelCell Energy, Inc.	(38,125)		(34,358)		(35,495)
Preferred stock dividends	(3,200)		(3,200)		(3,201)
Net loss to common shareholders	$ (41,325)		$ (37,558)		$ (38,696)
Net loss to common shareholders per share
Basic	$ (0.17)		$ (0.20)		$ (0.23)
Diluted	$ (0.17)	[1]	$ (0.20)	[1]	$ (0.23)	[1]
Weighted average shares outstanding
Basic	245,686,983		186,525,001		165,471,261
Diluted	245,686,983		186,525,001		165,471,261

[1] Due to the net loss to common shareholders in each of the years presented above, diluted earnings per share was computed without consideration to potentially dilutive instruments as their inclusion would have been antidilutive. Potentially dilutive instruments include stock options, warrants, unvested RSAs and RSUs, convertible preferred stock and convertible notes. At October 31, 2014, 2013 and 2012, there were options to purchase 3.0 million, 3.2 million and 3.1 million shares of common stock, respectively and at October 31, 2014 and 2013, there were warrants to purchase 5.75 million and 5.0 million, respectively shares of common stock that were not included in the calculation of diluted earnings per share as they would be antidiulutive. There were no warrants outstanding at October 31, 2012.