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Summary of Significant Accounting Policies - Schedule of basic and diluted net income per share (FY) (Details) - USD ($) | 3 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Denominator: |  |  |  |  |  |
Weighted-average shares outstanding | 5,193,750 | 5,193,750 | 4,166,586 | 5,193,750 | 5,193,750 | 5,193,750
Weighted-average shares outstanding | 5,193,750 | 5,193,750 | 4,166,586 | 5,193,750 | 5,193,750 | 5,193,750
Basic and diluted net (loss) income per share | $ (0.06) | $ 0.07 | $ 0.06 | $ 0.08 | $ 0.28 | $ 0.3
Common stock subject to possible redemption [Member] |  |  |  |  |  |
Numerator: |  |  |  |  |  |
Allocation of net income | $ (58,017) | $ 1,384,778 | $ 45,224 | $ 503,233 | $ 5,248,577 | $ 5,627,425
Denominator: |  |  |  |  |  |
Weighted-average shares outstanding | 974,132 | 18,975,000 | 738,327 | 6,183,174 | 18,975,000 | 18,975,000
Weighted-average shares outstanding | 974,132 | 18,975,000 | 738,327 | 6,183,174 | 18,975,000 | 18,975,000
Basic and diluted net (loss) income per share | $ (0.06) | $ 0.07 | $ 0.06 | $ 0.08 | $ 0.28 | $ 0.3
Common Stock [Member] |  |  |  |  |  |
Numerator: |  |  |  |  |  |
Allocation of net income | $ (309,328) | $ 379,035 | $ 255,209 | $ 422,706 | $ 1,436,616 | $ 1,540,313
Denominator: |  |  |  |  |  |
Weighted-average shares outstanding | 5,193,750 | 5,193,750 | 4,166,586 | 5,193,750 | 5,193,750 | 5,193,750
Weighted-average shares outstanding |  |  | 4,166,586 |  |  | 5,193,750
Basic and diluted net (loss) income per share | $ (0.06) | $ 0.07 | $ 0.06 | $ 0.08 | $ 0.28 |

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