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Financial Instruments - Summary of Movement in Allowance for Impairment in Respect of Accounts Receivable (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Financial Instruments [Abstract] |  |
Balance, beginning of year | $ 752 |
Net remeasurement of impairment loss allowance | (632) | $ 752
Balance, end of year | $ 120 | $ 752

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2020-01-01 + Details
Name: | ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialInstrumentsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Net remeasurement of impairment loss allowance. + References No definition available. + Details
Name: | sndl_NetRemeasurementOfImpairmentLossAllowance
Namespace Prefix: | sndl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration