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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
	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

X

- 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

X

- References

No definition available.

+ Details

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

X

- 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