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Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
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Mar. 31, 2018 Segment
Disclosure Of Significant Accounting Policies [Abstract] |
Number of reportable segment | 1

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- Definition Disclosure of significant accounting policies. + References No definition available. + Details
Name: | cgc_DisclosureOfSignificantAccountingPoliciesAbstract
Namespace Prefix: | cgc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of reportable segment. + References No definition available. + Details
Name: | cgc_NumberOfReportableSegment
Namespace Prefix: | cgc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration