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Accounts Payable and Accrued Liabilities - Additional Information (Details) - CAD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Accounts Payable And Accrued Liabilities [Abstract]
Accounts payable and accrued liabilities	$ 89,571	$ 15,386
Property, plant and equipment	62,034	2,804
Professional fees	7,391	1,642
Compensation related liabilities	5,747	2,349
Miscellaneous liabilities	$ 14,399	$ 8,591

X

- Definition

Accounts payable and accrued liabilities.

+ References

No definition available.

+ Details

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

X

- Definition

Payables related to payroll and other compensation items.

+ References

No definition available.

+ Details

Name:	cgc_CompensationPayable
Namespace Prefix:	cgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Professional fees payable.

+ References

No definition available.

+ Details

Name:	cgc_ProfessionalFeesPayable
Namespace Prefix:	cgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Trade payable and accrued liabilities.

+ References

No definition available.

+ Details

Name:	cgc_TradePayableAndAccruedLiabilities
Namespace Prefix:	cgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amounts payable 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
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+ Details

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

X

- Definition

The amount of payables for the purchase of non-current assets. [Refer: Non-current assets]

+ References

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

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Balance Type:	credit
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