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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)        
Net loss $ (29,239) $ (41,932) $ (91,827) $ (98,945)
(Loss) gain on foreign currency translation, net of tax (3,072) 8,674 (2,005) 3,363
(Loss) gain on cash flow hedges, net of tax (2,183) (494) (5,725) 7,699
Total other comprehensive (loss) income (5,255) 8,180 (7,730) 11,062
Total comprehensive loss (34,494) (33,752) (99,557) (87,883)
Comprehensive loss attributable to non-controlling interest (9,784) (8,567) (27,999) (23,294)
Total comprehensive loss attributable to Fluence Energy, Inc. $ (24,710) $ (25,185) $ (71,558) $ (64,589)