Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation	The condensed consolidated financial statements of MSA Safety Incorporated and its subsidiaries (“MSA” or “the Company”) are unaudited. These unaudited condensed consolidated financial statements include all adjustments, consisting of normal recurring adjustments, considered necessary by management to fairly state the Company's results. Intercompany accounts and transactions have been eliminated. The results reported in these unaudited condensed consolidated financial statements are not necessarily indicative of the results that may be expected for the entire year. The December 31, 2025, Balance Sheet data was derived from the audited Consolidated Balance Sheets, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”). This Form 10-Q report should be read in conjunction with MSA's Form 10-K for the year ended December 31, 2025, which includes all disclosures required by U.S. GAAP.
Recently Adopted and Recently Issued Accounting Standards	In the first quarter 2026, the Company early adopted Accounting Standards Update ("ASU") 2025‑06, Targeted Improvements to the Accounting for Internal-Use Software. The ASU updates guidance related to recognition and capitalization costs incurred to develop or obtain internal-use software, including certain cloud-based software arrangements, and clarifies related disclosure requirements. The company adopted the ASU prospectively as of January 1, 2026, in accordance with the transition provisions of the standard. Accordingly, amounts capitalized prior to the adoption date were not adjusted, and the new guidance applies only to qualifying costs incurred after adoption. Therefore, the adoption of the standard did not have an impact on the Company’s condensed consolidated financial statements for the quarter ended March 31, 2026.

MSA Safety Inc 10-Q