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Prepaid Expenses and Other Assets - Additional Information (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2018 CAD ($)
Prepaid Expenses And Other Assets [Abstract]
Other long-term assets	$ 8,340
Deposits on property, plant and equipment	6,487
Lease payments	$ 1,853

X

- Definition

Prepaid expenses and other assets.

+ References

No definition available.

+ Details

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

X

- Definition

Deposit or prepayment made associated with a lease. Amount will be amortized over the lease term.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of long-term deposits held by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
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-URIDate 2017-03-09

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of assets that the entity does not separately disclose in the same statement or note.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

+ Details

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