v3.25.2
Cover
3 Months Ended
Jul. 30, 2025
Jun. 30, 2025
Cover [Abstract]    
Document Type 6-K  
Entity Central Index Key 0001973239  
Document Fiscal Year Focus 2026  
Document Period End Date Jul. 30, 2025  
Amendment Flag false  
Entity Registrant Name ARM HOLDINGS PLC /UK  
Current Fiscal Year End Date   --06-30
Document Fiscal Period Focus   Q1