Condensed Consolidated Statements of Earnings and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
Net sales	$ 623,513	$ 587,153	$ 1,793,463	$ 1,714,710
Cost of sales	334,251	312,096	957,711	916,551
Gross profit	289,262	275,057	835,752	798,159
Operating expenses:
Research and development and other engineering expense	20,793	20,546	61,399	59,759
Selling expense	56,123	52,997	166,730	160,755
General and administrative expense	85,375	75,329	238,229	219,977
Total operating expenses	162,291	148,872	466,358	440,491
Acquisition and integration related costs	309	1,356	449	4,992
Net gain on disposal of assets	(14,081)	(25)	(14,361)	(460)
Income from operations	140,743	124,854	383,306	353,136
Interest income, net and other finance costs	2,317	1,668	4,315	4,111
Other & foreign exchange gain (loss), net	777	(29)	151	352
Income before taxes	143,837	126,493	387,772	357,599
Provision for income taxes	36,393	32,974	98,903	90,821
Net income	107,444	93,519	288,869	266,778
Other comprehensive income
Translation adjustments and other, net of tax	352	26,320	64,610	4,409
Unamortized pension adjustments, net of tax	(16)	(367)	394	(653)
Cash flow hedge adjustment, net of tax	5,158	(11,427)	(39,389)	(4,121)
Comprehensive net income	$ 112,938	$ 108,045	$ 314,484	$ 266,413
Net income per common share:
Basic	$ 2.59	$ 2.22	$ 6.92	$ 6.31
Diluted	$ 2.58	$ 2.21	$ 6.89	$ 6.28
Weighted-average number of shares outstanding
Basic	41,520	42,151	41,737	42,254
Diluted	41,704	42,335	41,903	42,464
Cash dividends declared per common share	$ 0.29	$ 0.28	$ 0.86	$ 0.83

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.