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Comparative amounts | 12 Months Ended
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Mar. 31, 2018
Comparative Amounts [Abstract] |
Comparative Amounts | 32. COMPARATIVE AMOUNTS Certain comparative amounts have been reclassified to conform to the current presentation.

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- Definition Comparative amounts. + References No definition available. + Details
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Namespace Prefix: | cgc_
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- Definition Comparative amounts explanatory. + References No definition available. + Details
Name: | cgc_ComparativeAmountsExplanatory
Namespace Prefix: | cgc_
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Balance Type: | na
Period Type: | duration