Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

Document And Entity Information - USD ($)
12 Months Ended
May 31, 2021
Aug. 20, 2021
Nov. 30, 2020
Document Information Line Items      
Entity Registrant Name CLS HOLDINGS USA, INC.    
Document Type 10-K    
Current Fiscal Year End Date --05-31    
Entity Common Stock, Shares Outstanding   128,158,082  
Entity Public Float     $ 11,866,330
Amendment Flag false    
Entity Central Index Key 0001522222    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date May 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 000-55546    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 45-1352286    
Entity Address, Address Line One 11767 South Dixie Highway, Suite 115    
Entity Address, City or Town Miami    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33156    
City Area Code 888    
Local Phone Number 438-9132    
Title of 12(b) Security N/A    
No Trading Symbol Flag true    
Security Exchange Name NONE    
Entity Interactive Data Current Yes