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Subsequent Events (Q3) (Details) |  |  |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended
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Dec. 11, 2023 USD ($) Extension $ / shares shares | Nov. 30, 2023 USD ($) | Nov. 01, 2023 USD ($) | Oct. 16, 2023 Shareholder | Oct. 01, 2023 USD ($) | Apr. 25, 2023 USD ($) Extension $ / shares shares | Apr. 05, 2023 USD ($) Extension $ / shares | Jan. 25, 2024 USD ($) | Dec. 31, 2023 USD ($) | Nov. 30, 2023 USD ($) | Oct. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) shares | Dec. 31, 2022 USD ($) $ / shares shares
Subsequent Events [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of extension to consummate business combination |  |  |  |  |  |  |  |  |  |  |  |  | 1 month |  |  | 1 month
Trust extension funding |  |  |  |  |  |  |  |  |  |  |  |  | $ 975,000 | $ 0 |  |
Lenders contribution deposited in trust account |  |  |  |  |  | $ 162,500 |  |  |  |  |  |  |  |  |  |
Lenders contribution deposited in trust account (dollar per share) | $ / shares |  |  |  |  |  | $ 0.0325 |  |  |  |  |  |  |  |  |  |
Cash deposited in Trust Account |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 234,600,000 | $ 0
Amount drawn |  |  |  |  |  |  |  |  |  |  |  |  | 1,025,000 | $ 0 |  |
Outstanding amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,025,000 | 1,025,000 |  |  | 0
Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,025,000 | $ 1,025,000 |  |  | $ 0
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock subject to possible redemption (in shares) | shares |  |  |  |  |  | 17,297,209 |  |  |  |  |  | 5,702,791 | 5,702,791 |  | 23,000,000 | 23,000,000
Redemption price (in dollars per share) | $ / shares |  |  |  |  |  | $ 10.4 |  |  |  |  |  | $ 10.79 | $ 10.79 |  |  | $ 10.31
Aggregate redemption amount |  |  |  |  |  | $ 179,860,588 |  |  |  |  |  | $ 179,860,588 | $ 179,860,588 |  |  |
Trust extension funding |  |  |  |  |  |  |  |  |  |  |  |  | $ 975,000 |  |  | $ 0
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extensions to extend time to consummate a business combination | Extension |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of public holders required for continued listing | Shareholder |  |  |  | 400 |  |  |  |  |  |  |  |  |  |  |  |
Notice period for minimum public holders rule |  |  |  | 45 days |  |  |  |  |  |  |  |  |  |  |  |
Additional cash deposited in Trust Account |  |  |  |  |  |  |  |  |  | $ 162,500 | $ 162,500 |  |  |  |  |
Trust extension funding |  |  |  |  |  |  |  |  |  | 1,300,000 | 1,137,500 |  |  |  |  |
Lenders contribution deposited in trust account |  |  |  |  |  |  | $ 1,462,500 |  |  |  |  |  |  |  |  |
Lenders contribution deposited in trust account (dollar per share) | $ / shares |  |  |  |  |  |  | $ 0.2925 |  |  |  |  |  |  |  |  |
Cash deposited in Trust Account | $ 103,055 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn |  |  | $ 162,500 |  | $ 162,500 |  |  |  | $ 25,000 | $ 187,500 | $ 100,000 | $ 50,000 |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Second Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn |  | $ 162,500 |  |  |  |  |  | 170,000 | $ 205,000 |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | $ 375,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock subject to possible redemption (in shares) | shares | 3,985,213 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price (in dollars per share) | $ / shares | $ 10.95 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate redemption amount | $ 43,638,082 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lenders contribution deposited in trust account | $ 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lenders contribution deposited in trust account (dollar per share) | $ / shares | $ 0.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extensions to extend time to consummate a business combination | Extension | 7 |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |

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