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

X

- 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