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Financial Statement Schedule I - STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements
Net income	$ 147,246	$ 166,555	$ 242,431
Other comprehensive income (loss) (net of tax of nil)	76,188	319	(50,577)
Comprehensive income attributable to Canadian Solar Inc.	227,631	172,127	180,955
Reportable Legal Entities [Member] | Parent Company
Condensed Financial Statements
Net income	146,703	171,585	237,070
Other comprehensive income (loss) (net of tax of nil)	80,928	542	(56,115)
Comprehensive income attributable to Canadian Solar Inc.	$ 227,631	$ 172,127	$ 180,955

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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