Investments - Additional Information (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 CAD ($) Quarter	Dec. 31, 2019 CAD ($)
Disclosure Of Transactions Between Related Parties [Line Items]
Net revenue	$ 60,918	$ 63,562
Zenabis
Disclosure Of Transactions Between Related Parties [Line Items]
Cash transferred	58,900
Principal amount of senior secured debt	$ 58,900
Rate of interest on investments.	14.00%
Maturity date of investments	Mar. 31, 2025
Scheduled repayments of principle over time	$ 7,000
Number of royalty payable quarters \| Quarter	32
Proceeds form principal repayments	$ 7,000
Zenabis \| Net revenue in between 20 million and 25 millions \| Cannabis
Disclosure Of Transactions Between Related Parties [Line Items]
Percentage of net revenue	3.50%
Zenabis \| Net revenue in between 20 million and 25 millions \| Cannabis \| Bottom of Range
Disclosure Of Transactions Between Related Parties [Line Items]
Net revenue	$ 20,000
Zenabis \| Net revenue in between 20 million and 25 millions \| Cannabis \| Top of Range
Disclosure Of Transactions Between Related Parties [Line Items]
Net revenue	$ 25,000
Zenabis \| Net revenue in between 25 million and 30 millions \| Cannabis
Disclosure Of Transactions Between Related Parties [Line Items]
Percentage of net revenue	3.00%
Zenabis \| Net revenue in between 25 million and 30 millions \| Cannabis \| Bottom of Range
Disclosure Of Transactions Between Related Parties [Line Items]
Net revenue	$ 25,000
Zenabis \| Net revenue in between 25 million and 30 millions \| Cannabis \| Top of Range
Disclosure Of Transactions Between Related Parties [Line Items]
Net revenue	$ 30,000
Zenabis \| Net revenue in between 30 million and 37.5 millions \| Cannabis
Disclosure Of Transactions Between Related Parties [Line Items]
Percentage of net revenue	2.50%
Zenabis \| Net revenue in between 30 million and 37.5 millions \| Cannabis \| Bottom of Range
Disclosure Of Transactions Between Related Parties [Line Items]
Net revenue	$ 30,000
Zenabis \| Net revenue in between 30 million and 37.5 millions \| Cannabis \| Top of Range
Disclosure Of Transactions Between Related Parties [Line Items]
Net revenue	$ 37,500
Zenabis \| Net revenue more than 37.5 million \| Cannabis
Disclosure Of Transactions Between Related Parties [Line Items]
Percentage of net revenue	2.00%
Net revenue	$ 37,500

The cash inflow from repayment to the entity of loans and advances made to related parties. [Refer: Related parties [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_16&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2020-01-01
-Paragraph B64
-Subparagraph f
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B64_f_i&doctype=Appendix&subtype=B
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_CashTransferred
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

- Definition

The amount of non-current loans and receivables. [Refer: Loans and receivables]

+ 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 8
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_8_c&doctype=Standard&book=b
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_NoncurrentLoansAndReceivables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2020-01-01
-Paragraph 28
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_a&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2020-01-01
-Paragraph 23
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23_a&doctype=Standard
-URIDate 2020-01-01

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2020-01-01
-Paragraph 32
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_32&doctype=Standard
-URIDate 2020-01-01

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2020-01-01
-Paragraph 33
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_33_a&doctype=Standard
-URIDate 2020-01-01

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2020-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_34&doctype=Standard
-URIDate 2020-01-01

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 82
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82_a&doctype=Standard
-URIDate 2020-01-01

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 103
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_103&doctype=Standard
-URIDate 2020-01-01

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 102
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_102&doctype=Standard
-URIDate 2020-01-01

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2020-01-01
-Paragraph 33
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2020-en-r&anchor=para_33_b_i&doctype=Standard
-URIDate 2020-01-01

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2020-01-01
-Paragraph B12
-Subparagraph b
-Clause v
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B12_b_v&doctype=Appendix&subtype=B
-URIDate 2020-01-01

Reference 11: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 12
-IssueDate 2020-01-01
-Paragraph B10
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_Revenue
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Maturity date of investments.

+ References

No definition available.

+ Details

Name:	sndl_MaturityDateOfInvestments
Namespace Prefix:	sndl_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of royalty payable quarters.

+ References

No definition available.

+ Details

Name:	sndl_NumberOfRoyaltyPayableQuarters
Namespace Prefix:	sndl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of net revenue.

+ References

No definition available.

+ Details

Name:	sndl_PercentageOfNetRevenue
Namespace Prefix:	sndl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate of interest on investments.

+ References

No definition available.

+ Details

Name:	sndl_RateOfInterestOnInvestments
Namespace Prefix:	sndl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Scheduled repayments of principle over time.

+ References

No definition available.

+ Details

Name:	sndl_ScheduledRepaymentsOfPrincipleOverTime
Namespace Prefix:	sndl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=sndl_ZenabisInvestmentsLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfRateregulatedActivitiesAxis=sndl_NetRevenueExceedsOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=sndl_CannabisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfRateregulatedActivitiesAxis=sndl_NetRevenueExceedsTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfRateregulatedActivitiesAxis=sndl_NetRevenueExceedsThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfRateregulatedActivitiesAxis=sndl_NetRevenueExceedsFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: