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Summary of Significant Accounting Policies and Estimates - Earnings (Loss) per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended
Oct. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2022
Jun. 30, 2021
Loss per Share [Abstract]            
Net loss $ (20,317) $ (60,829) $ (38,776) $ (212,676) $ (232,992) $ (74,804)
Less: Net loss attributable to the non-controlling interest   (41,482) $ (38,776)   (165,656) $ (74,804)
Net loss attributable to Fluence Energy, Inc.   $ (19,347)     $ (67,336)  
Weighted average number of Class A common shares outstanding, basic (in shares)   55,625,566     54,637,372  
Weighted average number of Class A common shares outstanding, diluted (in shares)   55,625,566     54,637,372  
Loss per share of Class A common stock, basic (in usd per share)   $ (0.35)     $ (1.23)  
Loss per share of Class A common stock, diluted (in usd per share)   $ (0.35)     $ (1.23)  
Common Class B-1            
Share-based Payment Arrangement [Abstract]            
Antidilutive security         58,586,695  
Stock options            
Share-based Payment Arrangement [Abstract]            
Antidilutive security         10,205,593  
Phantom Share Units (PSUs)            
Share-based Payment Arrangement [Abstract]            
Antidilutive security         605,591  
Restricted Stock Units (RSUs)            
Share-based Payment Arrangement [Abstract]            
Antidilutive security         1,584,196