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Subsequent Events - Additional Information (Details) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
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Mar. 15, 2021 USD ($) | Feb. 23, 2021 CAD ($) $ / shares shares | Feb. 22, 2021 USD ($) $ / shares shares | Feb. 12, 2021 $ / shares | Feb. 10, 2021 USD ($) $ / shares shares | Feb. 04, 2021 USD ($) $ / shares shares | Feb. 02, 2021 USD ($) $ / shares shares | Dec. 11, 2020 | Aug. 20, 2020 shares | Aug. 19, 2020 shares | Aug. 18, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2020 $ / shares shares | Dec. 04, 2020 USD ($) | Dec. 31, 2020 $ / shares | Feb. 16, 2021 CAD ($)
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per unit | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  | $ 0 |
Gross proceeds from offering | $ |  |  |  |  |  |  |  |  |  |  | $ 20.0 |  |  |  |  |
Term of warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Issuance of common shares | shares |  |  |  |  |  |  |  |  |  |  |  |  | 296,700,000 |  |  |
Gross proceeds from issuance of common shares | $ |  |  |  |  |  |  |  |  |  |  |  | $ 75.0 |  | $ 49.9 |  |
NASDAQ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional period allowed to regain compliance with listing qualifications |  |  |  |  |  |  |  | 180 days |  |  |  |  |  |  |  |
Regain compliance with listing qualifications initial period date |  |  |  | Feb. 01, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Regain compliance with listing qualifications initial end date |  |  |  | Feb. 12, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Series A Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units issued | shares |  |  |  |  |  |  |  |  |  |  | 25,800,000 |  |  |  |  |
Price per unit | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.50 |  |  |  |  |
Series B Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units issued | shares |  |  |  |  |  |  |  |  |  |  | 14,300,000 |  |  |  |  |
Price per unit | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.50 |  |  |  |  |
Series A Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  | 0.75 |  |  |  |  |
Series B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |
Warrants exercised | shares |  |  |  |  |  |  |  |  | 5,100,000 | 9,200,000 |  |  |  |  |  |
Issuance of common shares | shares |  |  |  |  |  |  |  |  | 5,100,000 | 9,200,000 |  |  |  |  |  |
January 2021 Units Offering | Series A Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units issued | shares |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |
Description of offering units |  |  |  |  |  |  | series A units (the “Series A Units”), each consisting of one common share and one-half series A warrant (collectively, the “Series A Warrants”) to purchase one common share |  |  |  |  |  |  |  |  |
Sale price per unit | $ / shares |  |  |  |  |  |  | $ 0.75 |  |  |  |  |  |  |  |  |
January 2021 Units Offering | Series B Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units issued | shares |  |  |  |  |  |  | 33,300,000 |  |  |  |  |  |  |  |  |
Description of offering units |  |  |  |  |  |  | series B units (the “Series B Units”), each consisting of one pre-funded series B warrant (the “Series B Warrants”) to purchase one common share and one-half Series A Warrant to purchase one common share |  |  |  |  |  |  |  |  |
Sale price per unit | $ / shares |  |  |  |  |  |  | $ 0.75 |  |  |  |  |  |  |  |  |
January 2021 Units Offering | Series A and series B units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from offering | $ |  |  |  |  |  |  | $ 100.0 |  |  |  |  |  |  |  |  |
January 2021 Units Offering | Top of Range | Series A and series B units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per unit | $ / shares |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
January 2021 Units Offering | Series A and Series B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
January 2021 Units Offering | Series A Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price | $ / shares |  |  |  |  |  |  | 0.80 |  |  |  |  |  |  |  |  |
Warrants exercised | shares |  |  | 63,300,000 |  | 3,300,000 |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares | shares |  |  | 63,300,000 |  | 3,300,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average warrant exercise price | $ / shares |  |  | $ 0.80 |  | $ 0.80 |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from warrants | $ |  |  | $ 50.7 |  | $ 2.7 |  |  |  |  |  |  |  |  |  |  |
January 2021 Units Offering | Series B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price | $ / shares |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Warrants exercised | shares |  |  |  |  |  |  | 33,300,000 |  |  |  |  |  |  |  |  |
Issuance of common shares | shares |  |  |  |  |  |  | 33,300,000 |  |  |  |  |  |  |  |  |
February 2021 Units Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
February 2021 Units Offering | Series A Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units issued | shares |  |  |  |  |  | 60,500,000 |  |  |  |  |  |  |  |  |  |
Description of offering units |  |  |  |  |  | additional series A units (the “Additional Series A Units”), each consisting of one common share and one-half additional series A warrant (collectively, the “Additional Series A Warrants”) to purchase one common share |  |  |  |  |  |  |  |  |  |
Sale price per unit | $ / shares |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |
February 2021 Units Offering | Series B Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units issued | shares |  |  |  |  |  | 14,000,000 |  |  |  |  |  |  |  |  |  |
Description of offering units |  |  |  |  |  | additional series B units (the “Additional Series B Units”), each consisting of one pre-funded additional series B warrant (the “Additional Series B Warrants”) to purchase one common share and one-half Additional Series A Warrant to purchase one common share |  |  |  |  |  |  |  |  |  |
Sale price per unit | $ / shares |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |
February 2021 Units Offering | Series A and series B units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from offering | $ |  |  |  |  |  | $ 74.5 |  |  |  |  |  |  |  |  |  |
February 2021 Units Offering | Top of Range | Series A and series B units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per unit | $ / shares |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |
February 2021 Units Offering | Series A Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price | $ / shares |  |  |  |  |  | 1.10 |  |  |  |  |  |  |  |  |  |
Warrants exercised | shares |  |  | 35,000,000 |  | 2,300,000 |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares | shares |  |  | 35,000,000 |  | 2,300,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average warrant exercise price | $ / shares |  |  | $ 1.10 |  | $ 1.10 |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from warrants | $ |  |  | $ 38.5 |  | $ 2.5 |  |  |  |  |  |  |  |  |  |  |
February 2021 Units Offering | Series B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price | $ / shares |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |
Warrants exercised | shares |  |  |  |  |  | 14,000,000 |  |  |  |  |  |  |  |  |  |
Issuance of common shares | shares |  |  |  |  |  | 14,000,000 |  |  |  |  |  |  |  |  |  |
Registered Offerings | Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of warrants |  |  | 42 months |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price | $ / shares |  |  | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock shares issuable upon conversion of warrants | shares |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued | shares |  |  | 98,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Bid Price Requirement | NASDAQ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regain compliance with listing qualifications common stock minimum bid price | $ / shares |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive business period to maintain minimum bid closing price |  |  |  | 10 days |  |  |  |  |  |  |  |  |  |  |  |
Strategic Investment | Indiva |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Announced strategic value investment | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22
Strategic Investment | Indiva | Brokered Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares | shares |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued price per share | $ / shares |  | $ 0.44 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common shares | $ |  | $ 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash out flow for non-revolving loan issuance | $ |  | $ 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture | SunStream Bancorp Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of joint venture ownership | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial commitment amount | $ | $ 100.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Weighted average warrant exercise price. + References No definition available. + Details
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Namespace Prefix: | sndl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_EntityListingsExchangeAxis=exch_XNAS
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=sndl_SeriesAUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=sndl_SeriesBUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=sndl_SeriesAWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=sndl_SeriesBWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=sndl_JanuaryTwoThousandTwentyOneUnitsOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=sndl_SeriesAAndSeriesBUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=sndl_SeriesAAndSeriesBWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=sndl_FebruaryTwoThousandTwentyOneUnitsOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=sndl_RegisteredOfferingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=sndl_WarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=sndl_MinimumBidPriceRequirementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=sndl_StrategicInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=sndl_IndivaLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CapitalRequirementsAxis=sndl_BrokeredPrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_JointVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_JointVenturesWhereEntityIsVenturerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |