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Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	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

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X

- Definition

Number of reportable segment.

+ References

No definition available.

+ Details

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Namespace Prefix:	cgc_
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