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Commitments and Contingencies - Additional Information (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Commitments And Contingencies [Abstract] |  |
Accrued financial penalties payable | $ 1.5 | $ 1.5

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- Definition Accrued financial penalties payable. + References No definition available. + Details
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Namespace Prefix: | sndl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of commitments and contingencies. + References No definition available. + Details
Name: | sndl_DisclosureOfCommitmentsAndContingenciesAbstract
Namespace Prefix: | sndl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration