Condensed Consolidated Statements of Earnings and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Net sales	$ 587,964	$ 538,895
Cost of sales	322,073	288,329
Gross profit	265,891	250,566
Operating expenses:
Research and development and other engineering expense	18,631	19,839
Selling expense	54,463	54,164
General and administrative expense	77,562	74,192
Total operating expenses	150,656	148,195
Acquisition and integration related costs	565	127
Net loss (gain) on disposal of assets	53	(75)
Income from operations	114,617	102,319
Interest income, net and other finance costs	4,433	1,103
Other & foreign exchange gain (loss), net	(2,752)	1,058
Income before taxes	116,298	104,480
Provision for income taxes	28,082	26,596
Net income	88,216	77,884
Other comprehensive income
Translation adjustments and other, net of tax	(14,483)	17,836
Unamortized pension adjustments, net of tax	(149)	420
Cash flow hedge adjustment, net of tax	12,153	(6,109)
Comprehensive net income	$ 85,737	$ 90,031
Net income per common share:
Basic	$ 2.14	$ 1.86
Diluted	$ 2.13	$ 1.85
Weighted-average number of shares outstanding
Basic	41,228	41,846
Diluted	41,366	42,010
Cash dividends declared per common share	$ 0.29	$ 0.28

Other & foreign exchange loss, net

No definition available.

Name:	ssd_OtherForeignExchangeLossNet
Namespace Prefix:	ssd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use; (3) to conduct internal product testing; (4) or to provide engineering support to customers in the form of testing services or product uses, specifications or requirements.

+ References

No definition available.