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Commitments and Contingencies - Additional Information (Details) - CAD ($)	Mar. 31, 2018	Mar. 31, 2015
Disclosure Of Commitments And Contingencies [Abstract]
Ongoing litigation claim amount		$ 330,000
Litigation settlement amount to other party	$ 0

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- References

No definition available.

+ Details

Name:	cgc_DisclosureOfCommitmentsAndContingenciesAbstract
Namespace Prefix:	cgc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Ongoing litigation claim amount.

+ References

No definition available.

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Name:	cgc_OngoingLitigationClaimAmount
Namespace Prefix:	cgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

The amount of contingent liabilities incurred relating to the entity's interests in associates. [Refer: Associates [member]; Contingent liabilities [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph 23
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_23_b&doctype=Standard
-URIDate 2017-03-09

+ Details

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