v3.26.1
COVER - shares
 3 Months Ended
Jul. 31, 2026
Sep. 04, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jul. 31, 2026  
Document Transition Report false  
Entity File Number 001-43081  
Entity Registrant Name Sunbelt Rentals Holdings, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 33-3657151  
Entity Address, Address Line One 1799 Innovation Pt  
Entity Address, City or Town Fort Mill  
Entity Address, State or Province SC  
Entity Address, Postal Zip Code 29715  
City Area Code 803  
Local Phone Number 578-5800  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol SUNB  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   409,764,897
Entity Central Index Key 0002083785  
Amendment Flag false  
Document Fiscal Year Focus 2027  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --04-30