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Description of business and summary of significant accounting policies, Initial Public Offering and Reorganization Transactions (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Jan. 16, 2024 USD ($) LLCUnit Vote shares $ / shares | Jan. 11, 2024 LLCUnit | Mar. 31, 2024 Vote
Initial Public Offering [Abstract] |  |  |  |
Ownership interests recapitalized into LLC interests | LLCUnit |  | 44,871,794 |  |
Smith Douglas Holdings LLC [Member] | Continuing Equity Owners [Member] |  |  |  |
Initial Public Offering [Abstract] |  |  |  |
LLC Interests Purchased | LLCUnit |  |  | 2,436,000 |
Common Class A [Member] |  |  |  |
Initial Public Offering [Abstract] |  |  |  |
Number of votes per share | Vote |  |  |  | 1
LLC Interests Purchased | LLCUnit |  | 6,410,257 |  |
Value of LLC Interests Purchased | $ |  | $ 125.2 |  |
Common Class A [Member] | Smith Douglas Holdings LLC [Member] | Continuing Equity Owners [Member] |  |  |  |
Initial Public Offering [Abstract] |  |  |  |
LLC Interests Purchased | shares |  | 2,435,897 |  |
Value of LLC Interests Purchased | $ |  | $ 47.6 |  |
Common Class B [Member] |  |  |  |
Initial Public Offering [Abstract] |  |  |  |
Number of votes per share | Vote | [1] |  |  | 10
Maximum number of Class B common stock outstanding compared to total of Class A and Class B common stock outstanding for occurrence of Sunset |  | 10.00% |  |
Shares issued (in shares) | shares |  | 42,435,897 |  |
IPO [Member] | Common Class A [Member] |  |  |  |
Initial Public Offering [Abstract] |  |  |  |
Number of shares issued (in shares) | shares |  | 8,846,154 |  |
Net proceeds | $ |  | $ 172.8 |  |
Number of votes per share | Vote |  | 1 |  |
Offering price per share (in dollars per share) | $ / shares |  | $ 21 |  |
IPO [Member] | Common Class B [Member] |  |  |  |
Initial Public Offering [Abstract] |  |  |  |
Number of votes per share | Vote |  | 10 |  |
Underwriters' Option [Member] | Common Class A [Member] |  |  |  |
Initial Public Offering [Abstract] |  |  |  |
Number of shares issued (in shares) | shares |  | 1,153,846 |  |
[1] | Each share of Class B common stock entitles its holders to ten votes per share on all matters presented to the stockholders and on which the holders of the Class B common stock are entitled to vote; provided, that each share of Class B common stock will only be entitled to one vote per share on all matters presented to the stockholders generally upon the Sunset Date.

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