Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company currently maintains the Simpson Manufacturing Co., Inc. Amended and Restated 2011 Incentive Plan (the “2011 Plan”) as its only equity incentive plan. Under the 2011 Plan, no more than 16.3 million shares of the Company’s common stock in aggregate may be issued, including shares already issued pursuant to prior awards granted under the 2011 Plan. Shares of the Company's common stock underlying awards to be issued pursuant to the 2011 Plan are registered under the Securities Act of 1933. Under the 2011 Plan, the Company may grant restricted stock and restricted stock units. The Company currently intends to award only performance-based stock units ("PSUs") and/or time-based restricted stock units ("RSUs"). The Company allocates stock-based compensation expense amongst cost of sales, research and development and other engineering expense, selling expense, or general and administrative expense based on the job functions performed by the employees to whom the stock-based compensation is awarded. Stock-based compensation capitalized in inventory was immaterial for all periods presented. The Company recognized stock-based compensation expense related to its equity plans for employees of $5.1 million and $6.5 million for the three months ended June 30, 2024 and 2023, respectively, and $10.4 million and $11.2 million for the six months ended June 30, 2024 and 2023, respectively. During the six months ended June 30, 2024, the Company granted an aggregate of 160,808 RSUs and PSUs to the Company's employees, including officers at an estimated weighted-average fair value of $177.59 per share based on the closing price (adjusted for certain market factors primarily the present value of dividends) of the Company's common stock on the grant date. The RSUs and PSUs granted to the Company's employees may be time-based, performance-based, or time and performance-based. Certain of the PSUs are granted to officers and key employees, where the number of performance-based awards to be issued is based on the achievement of certain Company performance criteria established in the award agreement over a cumulative three year period. These awards cliff vest after three years. In addition, these same officers and key employees also receive time-based RSUs, which vest pursuant to a three-year graded vesting schedule. Time based RSUs are granted to the Company's employees excluding officers and certain key employees, vest ratably over the four year vesting-term of the award. The Company’s seven non-employee directors are entitled to receive an aggregate of approximately $0.9 million in equity compensation annually under the Company's non-employee director compensation program. The number of shares ultimately granted are based on the average closing share price for the Company's common stock over the 60 day period prior to approval of the award in the second quarter of each year. In May 2024, the Company granted 4,692 shares of the Company's common stock to the non-employee directors, based on the average closing price of $173.89 per share and recognized $0.8 million of expense. As of June 30, 2024, the Company's aggregate unamortized stock compensation expense was approximately $35.1 million which is expected to be recognized in expense over a weighted-average period of 2.5 years.