v3.26.1
Cover - USD ($)
$ in Billions
 12 Months Ended
May 31, 2026
Jul. 17, 2026
Nov. 21, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date May 31, 2026    
Current Fiscal Year End Date --05-31    
Document Transition Report false    
Entity File Number 1-37830    
Entity Registrant Name LAMB WESTON HOLDINGS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 61-1797411    
Entity Address, Address Line One 599 S. Rivershore Lane    
Entity Address, City or Town Eagle    
Entity Address, State or Province ID    
Entity Address, Postal Zip Code 83616    
City Area Code 208    
Local Phone Number 938-1047    
Title of 12(b) Security Common Stock, $1.00 par value    
Trading Symbol LW    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 8.0
Entity Common Stock, Shares Outstanding   137,481,011  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission in connection with its 2026 Annual Meeting of Stockholders are incorporated by reference into Part III of this report.
    
Amendment Flag false    
Document Fiscal Year Focus 2026    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001679273