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Revenue - Additional Information (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue [Abstract]
Maximum period to settle receivables from contracts with customers	30 days
Impairment loss (reversal) on receivables from contracts with customers	$ (0.5)	$ 0.6

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No definition available.

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Impairment loss (reversal) on receivables or contract assets arising from contracts with customers.

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No definition available.

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Namespace Prefix:	sndl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Maximum period to settle receivables from contracts with customers.

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No definition available.

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Name:	sndl_MaximumPeriodToSettleReceivablesFromContractsWithCustomers
Namespace Prefix:	sndl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration