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Convertible Notes - Schedule of Change in Principal Balance of Secured Convertible Note (Details) - CAD ($) $ in Thousands |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 05, 2020 | Dec. 31, 2020 | Dec. 31, 2020
Convertible Notes [Abstract] |  |  |
Issued |  |  | $ 73,227
Converted to common shares | $ (73,200) | $ (73,200) | $ (73,227)

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- Definition Information about convertible notes + References No definition available. + Details
Name: | sndl_ConvertibleNotesAbstract
Namespace Prefix: | sndl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Secured convertible notes issued. + References No definition available. + Details
Name: | sndl_SecuredConvertibleNotesIssued
Namespace Prefix: | sndl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Secured convertible notes principal balance converted to common shares. + References No definition available. + Details
Name: | sndl_SecuredConvertibleNotesPrincipalBalanceConvertedToCommonShares
Namespace Prefix: | sndl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration