Document and Entity Information (USD $)	12 Months Ended
	Oct. 31, 2013	Dec. 31, 2013	Apr. 30, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	FUELCELL ENERGY INC
Entity Central Index Key	0000886128
Document Type	10-K
Document Period End Date	Oct. 31, 2013
Amendment Flag	false
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q4
Current Fiscal Year End Date	--10-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		205,379,875
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 164,856,867
Share Price			$ 1.05