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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.