v3.26.1
Cover - shares
3 Months Ended
Mar. 31, 2026
May 01, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-36563  
Entity Registrant Name ORION S.A.  
Entity Incorporation, State or Country Code N4  
Entity Tax Identification Number 98-1007234  
Entity Address, Address Line One 1700 City Plaza Drive, Suite 300  
Entity Address, City or Town Spring  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77389  
City Area Code 281  
Local Phone Number 318-2959  
Title of 12(b) Security Common Shares, no par value  
Trading Symbol OEC  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   56,388,649
Entity Central Index Key 0001609804  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Amendment Flag false