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Biological Assets - Additional Information (Details) | Mar. 31, 2018 | Mar. 31, 2017
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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
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Namespace Prefix: | cgc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
Period Type: | duration