XML 136 R113.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Share Capital - Summary of Warrants (Details) | 12 Months Ended
--- | ---
Mar. 31, 2018 CAD ($) shares
Disclosure Of Warrants [Line Items] |
Exercise of warrants | shares | (207,297)
Number of whole warrants, Ending Balance | shares | 18,912,012
Exercise of warrants | $ 3.72
Average Exercise Price of Warrants, Ending Balance | 12.96
Exercise of warrants | (1,113,000)
Warrant value, Ending Balance | $ 70,454,000
R Trees |
Disclosure Of Warrants [Line Items] |
rTrees acquisition | shares | 242,408
rTrees acquisition | $ 3.83
rTrees acquisition | $ 1,302,000
Warrant expiration date | April 30, 2018
Greenstar investment |
Disclosure Of Warrants [Line Items] |
Greenstar equity investment - net of warrant issue cost | shares | 18,876,901
Greenstar equity investment - net of warrant issue cost | $ 12.98
Greenstar equity investment - net of warrant issue cost | $ 70,265,000
Warrant expiration date | May 1, 2020

X
- Definition Average exercise price on warrants exercised. + References No definition available. + Details
Name: | cgc_AverageExercisePriceOnWarrantsExercised
Namespace Prefix: | cgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Disclosure of warrants. + References No definition available. + Details
Name: | cgc_DisclosureOfWarrantsLineItems
Namespace Prefix: | cgc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of whole warrants. + References No definition available. + Details
Name: | cgc_NumberOfWholeWarrants
Namespace Prefix: | cgc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of whole warrants on acquisition. + References No definition available. + Details
Name: | cgc_NumberOfWholeWarrantsOnAcquisition
Namespace Prefix: | cgc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of whole warrants on equity investment. + References No definition available. + Details
Name: | cgc_NumberOfWholeWarrantsOnEquityInvestment
Namespace Prefix: | cgc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of whole warrants on exercise of warrants. + References No definition available. + Details
Name: | cgc_NumberOfWholeWarrantsOnExerciseOfWarrants
Namespace Prefix: | cgc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrant average exercise price. + References No definition available. + Details
Name: | cgc_WarrantAverageExercisePrice
Namespace Prefix: | cgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Warrant expiration date. + References No definition available. + Details
Name: | cgc_WarrantExpirationDate
Namespace Prefix: | cgc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrant value. + References No definition available. + Details
Name: | cgc_WarrantValue
Namespace Prefix: | cgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Warrant value exercise of warrants. + References No definition available. + Details
Name: | cgc_WarrantValueExerciseOfWarrants
Namespace Prefix: | cgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Warrant value on acquisition. + References No definition available. + Details
Name: | cgc_WarrantValueOnAcquisition
Namespace Prefix: | cgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Warrant value on equity investment. + References No definition available. + Details
Name: | cgc_WarrantValueOnEquityInvestment
Namespace Prefix: | cgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Warrants average exercise price on acquisition. + References No definition available. + Details
Name: | cgc_WarrantsAverageExercisePriceOnAcquisition
Namespace Prefix: | cgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Warrants average exercise price on equity investments. + References No definition available. + Details
Name: | cgc_WarrantsAverageExercisePriceOnEquityInvestments
Namespace Prefix: | cgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_BusinessCombinationsAxis=cgc_RTreesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cgc_GreenstarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |