v3.26.1
COVER - USD ($)
 12 Months Ended
Apr. 30, 2026
Jun. 18, 2026
Oct. 31, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Apr. 30, 2026    
Current Fiscal Year End Date --04-30    
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 Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   409,760,584  
Documents Incorporated by Reference
Certain information required by Part III of this Annual Report on Form 10-K is incorporated by reference from the registrant’s definitive proxy statement for the 2026 Annual Meeting of Stockholders, to be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year covered by this report.
    
Entity Central Index Key 0002083785    
Amendment Flag false    
Document Fiscal Year Focus 2026    
Document Fiscal Period Focus FY    
Entity Public Float     $ 0