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SUBSEQUENT EVENTS (Details) - Feb. 28, 2021 $ in Millions, ¥ in Billions | JPY (¥) | USD ($)
--- | --- | ---
Subsequent event | Japan Green Infrastructure Fund [Member] |  |
SUBSEQUENT EVENTS |  |
Disposal Group, Including Discontinued Operation, Consideration | ¥ 22 | $ 208

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- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=csiq_JapanGreenInfrastructureFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |