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Assets Classified as Held for Sale - Additional Information (Details) - CAD ($) $ in Thousands		12 Months Ended
	Sep. 13, 2017	Mar. 31, 2018
Noncurrent Assets Or Disposal Groups Classified As Held For Sale Or As Held For Distribution To Owners [Abstract]
Proceeds on assets classified as held for sale	$ 7,000	$ 7,000
Deferred tax liabilities		$ 820
Term of agreement		3 years

X

- Definition

Deferred tax liabilities associated with assets held for sale.

+ References

No definition available.

+ Details

Name:	cgc_DeferredTaxLiabilitiesAssociatedWithAssetsHeldForSale
Namespace Prefix:	cgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Term of agreement.

+ References

No definition available.

+ Details

Name:	cgc_TermOfAgreement
Namespace Prefix:	cgc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The cash inflow from the disposal of non-current assets or disposal groups classified as held for sale and discontinued operations. [Refer: Discontinued operations [member]; Disposal groups classified as held for sale [member]; Non-current assets or disposal groups classified as held for sale]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_16&doctype=Standard
-URIDate 2017-03-09

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration