Award Timing Disclosure	12 Months Ended
Award Timing Disclosure	Sep. 30, 2024
Award Timing Disclosures [Line Items]
Award Timing MNPI Disclosure	Practices Related to the Grant of Certain Equity Awards Close in Time to the Release of Material Nonpublic Information During fiscal year 2024 and the first quarter of fiscal year 2025, we granted, and in the future, we plan to grant, annual long-term incentive compensation awards to our executives and employees, including stock options, restricted stock unit awards, and performance stock unit awards during the first fiscal quarter of the year. The Board meets in the first few weeks of December, during the open trading window following the filing of our Form 10-K for the prior fiscal year. Accordingly, we do not have a practice or policy of granting equity awards in anticipation of the release of material non-public information and we do not time the release of material non-public information in coordination with grants of equity awards to affect the value of our NEOs’ compensation.
Award Timing Method	During fiscal year 2024 and the first quarter of fiscal year 2025, we granted, and in the future, we plan to grant, annual long-term incentive compensation awards to our executives and employees, including stock options, restricted stock unit awards, and performance stock unit awards during the first fiscal quarter of the year. The Board meets in the first few weeks of December, during the open trading window following the filing of our Form 10-K for the prior fiscal year.
Award Timing Predetermined	true
Award Timing MNPI Considered	false
Award Timing, How MNPI Considered	we do not have a practice or policy of granting equity awards in anticipation of the release of material non-public information and we do not time the release of material non-public information in coordination with grants of equity awards to affect the value of our NEOs’ compensation.
MNPI Disclosure Timed for Compensation Value	false

Fluence Energy, Inc. 10-K/A