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Financial Statement Schedule I - STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements
Net income	$ 166,555	$ 242,431	$ 102,983
Other comprehensive income (loss) (net of tax of nil):
Foreign currency translation adjustment	319	(50,577)	39,305
Comprehensive income attributable to Canadian Solar Inc.	172,127	180,955	137,352
Reportable Legal Entities [Member] | Parent Company
Condensed Financial Statements
Net income	171,585	237,070	99,572
Other comprehensive income (loss) (net of tax of nil):
Foreign currency translation adjustment	542	(56,115)	37,780
Comprehensive income attributable to Canadian Solar Inc.	$ 172,127	$ 180,955	$ 137,352

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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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