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Comparative amounts	12 Months Ended
	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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- Definition

Comparative amounts explanatory.

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No definition available.

+ Details

Name:	cgc_ComparativeAmountsExplanatory
Namespace Prefix:	cgc_
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Balance Type:	na
Period Type:	duration