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Related Party Transactions - Additional Information (Details) - Employees - Shareholder loan agreement $ in Thousands | 12 Months Ended
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Dec. 31, 2020 CAD ($) EMP | Dec. 31, 2019 CAD ($) EMP
Disclosure Of Transactions Between Related Parties [Line Items] |  |
Number of employees on loan agreement | EMP | 2 | 2
Loans and receivables available | $ 100 | $ 200
Repayment to one of the employees | $ 61 |
Bottom of Range |  |
Disclosure Of Transactions Between Related Parties [Line Items] |  |
Interest rate | 0.00% |
Top of Range |  |
Disclosure Of Transactions Between Related Parties [Line Items] |  |
Interest rate | 1.50% |

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
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Period Type: | instant

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- 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
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Balance Type: | na
Period Type: | duration

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- Definition The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than: (a) those that the entity intends to sell immediately or in the near term, which shall be classified as held for trading, and those that the entity, upon initial recognition, designates as at fair value through profit or loss; (b) those that the entity, upon initial recognition, designates as available for sale; or (c) those for which the holder may not recover substantially all of its initial investment, other than because of credit deterioration, which shall be classified as available for sale. An interest acquired in a pool of assets that are not loans or receivables (for example, an interest in a mutual fund or a similar fund) is not a loan or receivable. [Refer: Derivative 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 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
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of employees on loan agreement. + References No definition available. + Details
Name: | sndl_NumberOfEmployeesOnLoanAgreement
Namespace Prefix: | sndl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Payment to One of the Employees. + References No definition available. + Details
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Namespace Prefix: | sndl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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Period Type: |