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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net (loss) income $ (44,276) $ 6,894 $ (136,103) $ (92,051)
(Loss) gain on foreign currency translation, net of tax (2,862) 13,405 (4,867) 16,768
Gain (loss) on cash flow hedges, net of tax 14,200 (5,412) 8,475 2,287
Total other comprehensive income 11,338 7,993 3,608 19,055
Total comprehensive (loss) income (32,938) 14,887 (132,495) (72,996)
Comprehensive (loss) income attributable to non-controlling interest (8,463) 2,905 (36,462) (20,389)
Total comprehensive (loss) income attributable to Fluence Energy, Inc. $ (24,475) $ 11,982 $ (96,033) $ (52,607)