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Related Party Transactions - Transactions with Executive Officers and Directors (Michael Rispoli) (Details) - Michael J. Rispoli - USD ($) | Oct. 01, 2023 | Sep. 29, 2022
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Related Party Transaction |  |
Class of warrant or right, percentage receiving exchangeability |  | 25.00%
Class of warrant or right, percentage receiving exchangeability, pro rata |  | 20.00%
Restricted Stock Units |  |
Related Party Transaction |  |
Equity instruments other than options, vested in period (in shares) | 14,290 |
Number of conversion rights granted (in shares) |  | 500,000
Restricted Stock Units | Tranche One |  |
Related Party Transaction |  |
Number of conversion rights granted (in shares) |  | 100,000
Award vesting period |  | 7 years
Restricted Stock Units | Tranche Two |  |
Related Party Transaction |  |
Number of conversion rights granted (in shares) |  | 250,000
Restricted Stock Units | Tranche Three |  |
Related Party Transaction |  |
Number of conversion rights granted (in shares) |  | 50,000
Award vesting period |  | 7 years
Newmark Holdings PSU |  |
Related Party Transaction |  |
Class of warrant or right, rights receiving exchangeability (in shares) | 6,563 |
Class of warrants or right, exchangeable (in shares) |  | 20,221
Newmark Holdings PPSU |  |
Related Party Transaction |  |
Class of warrant or right, rights receiving exchangeability (in shares) | 2,194 |
Class of warrants or right, exchangeable (in shares) |  | 23,560
Warrants and rights outstanding |  | $ 283,527
Non-Exchangeable Newmark Holdings PSUs |  |
Related Party Transaction |  |
Class of warrant or right, rights receiving exchangeability (in shares) |  | 88,079
Non-Exchangeable Rights for Newmark Holdings PPSUs |  |
Related Party Transaction |  |
Class of warrant or right, rights receiving exchangeability (in shares) |  | 87,049

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