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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)

X

- 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

X

- 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

X

- 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