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SHORT-TERM NOTES PAYABLE (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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SHORT-TERM NOTES PAYABLE |  |
Short-term notes payable | $ 710,636 | $ 544,991

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- Definition Amount of borrowings classified s short term notes payable. + References No definition available. + Details
Name: | csiq_ShortTermNotesPayable
Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_NotesPayableAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration