XML 17 R1.htm IDEA: XBRL DOCUMENT v3.10.0.1
Document and Entity Information - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Oct. 31, 2018
Jan. 04, 2019
Apr. 30, 2018
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, 2018    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Trading Symbol FCEL    
Current Fiscal Year End Date --10-31    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   103,898,960  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 156,140,974
Share Price     $ 1.86