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Biological Assets - Additional Information (Details)	Mar. 31, 2018	Mar. 31, 2017
Disclosure Of Reconciliation Of Changes In Biological Assets [Abstract]
Average completion percentage of biological assets to the next expected harvest date	12.00%	43.00%

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- Definition

Average completion percentage of biological assets to next expected harvest date.

+ References

No definition available.

+ Details

Name:	cgc_AverageCompletionPercentageOfBiologicalAssetsToNextExpectedHarvestDate
Namespace Prefix:	cgc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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