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NON-CONTROLLING INTERESTS - Effects of changes in Company's ownership interest in less than wholly owned subsidiaries on equity attributable to Canadian Solar Inc (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
NON-CONTROLLING INTERESTS      
Net income attributable to Canadian Solar Inc. - basic $ 274,187,000 $ 239,968,000 $ 95,248,000
Transfers from the non-controlling interests:      
Increase in the Company's transfer of equity interest in subsidiary and subsidiary's offering of its equity interests 3,990,000    
CSI Solar      
NON-CONTROLLING INTERESTS      
Net income attributable to Canadian Solar Inc. - basic 274,187 239,968 95,248
Transfers from the non-controlling interests:      
Net transfers from non-controlling interests 283,024 11,729  
Change from net income attributable to Canadian Solar Inc. and transfers from non-controlling interests 557,211 251,697 $ 95,248
CSI Solar | Additional Paid-in Capital      
Transfers from the non-controlling interests:      
Increase in the Company's transfer of equity interest in subsidiary and subsidiary's offering of its equity interests 244,629 11,185  
CSI Solar | Accumulated Other Comprehensive Income (Loss)      
Transfers from the non-controlling interests:      
Increase in the Company's transfer of equity interest in subsidiary and subsidiary's offering of its equity interests $ 38,395 $ 544