v3.26.1
Schedule H, Part IV, Line 4(i) - Schedule of Assets (Held at End of Year) (Details) - EBP 001
12 Months Ended
Dec. 31, 2025
USD ($)
EBP, Schedule of Asset Held for Investment [Line Items]  
Entity tax identification number 94-3196943
Plan number 001
Total investments at fair value $ 500,230,701
Notes receivable from participants 7,850,190
Current Value $ 508,080,891
Vesting Period, One  
EBP, Schedule of Asset Held for Investment [Line Items]  
Vesting service period 1 year
Minimum  
EBP, Schedule of Asset Held for Investment [Line Items]  
Interest rate 5.25%
Maximum  
EBP, Schedule of Asset Held for Investment [Line Items]  
Interest rate 10.50%
Investment, Identifier [Axis]: Real Estate Index Fund Adm | Mutual Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value $ 2,776,375
Investment, Identifier [Axis]: Simpson Manufacturing Co., Inc. Common Stock | Common Stock  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 18,482,206
Investment, Identifier [Axis]: Vanguard Cash Reserves Federal MM Fund Admiral Shares | Money Market Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 11,734,680
Investment, Identifier [Axis]: Vanguard Eqty Inc Fnd Adm | Mutual Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 14,524,760
Investment, Identifier [Axis]: Vanguard Growth Index Fund Ins | Mutual Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 32,593,912
Investment, Identifier [Axis]: Vanguard Inst Index Fd Inst'l | Mutual Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 23,768,848
Investment, Identifier [Axis]: Vanguard Inst Target Ret Income Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 3,711,010
Investment, Identifier [Axis]: Vanguard Md-Cap Index Fund Ins | Mutual Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 16,877,751
Investment, Identifier [Axis]: Vanguard Retirement Savings Trust III | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 762,128
Investment, Identifier [Axis]: Vanguard Sm-Cap Index Fund Ins | Mutual Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 14,599,529
Investment, Identifier [Axis]: Vanguard Target Ret 2020 Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 9,978,047
Investment, Identifier [Axis]: Vanguard Target Ret 2025 Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 35,212,400
Investment, Identifier [Axis]: Vanguard Target Ret 2030 Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 48,933,004
Investment, Identifier [Axis]: Vanguard Target Ret 2035 Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 59,467,055
Investment, Identifier [Axis]: Vanguard Target Ret 2040 Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 52,415,068
Investment, Identifier [Axis]: Vanguard Target Ret 2045 Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 51,672,584
Investment, Identifier [Axis]: Vanguard Target Ret 2050 Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 31,483,852
Investment, Identifier [Axis]: Vanguard Target Ret 2055 Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 23,302,420
Investment, Identifier [Axis]: Vanguard Target Ret 2060 Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 12,360,653
Investment, Identifier [Axis]: Vanguard Target Ret 2065 Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 5,245,008
Investment, Identifier [Axis]: Vanguard Target Ret 2070 Fund Trust II | Common Collective Trust  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 332,197
Investment, Identifier [Axis]: Vanguard Total Bond Idx Inst | Mutual Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value 13,013,531
Investment, Identifier [Axis]: Vanguard Total International Stock Index Fund | Mutual Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Total investments at fair value $ 16,983,683