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RELATED PARTY TRANSACTIONS (Details) - CAD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disclosure of transactions between related parties [line items]
Non-current receivables	$ 131.8	$ 134.8
Joint ventures
Disclosure of transactions between related parties [line items]
Finance lease receivables	9.3	12.4
Loans and receivables	8.9	8.4
Non-current receivables	$ 7.2	6.6
Joint ventures | Fixed interest rate
Disclosure of transactions between related parties [line items]
Finance lease receivable, interest rate	5.14%
Loans and receivables, interest rate	2.50%
Other related parties
Disclosure of transactions between related parties [line items]
Services received, related party transactions	$ 0.8	$ 1.4

X

- Definition

Finance lease receivable, interest rate

+ References

No definition available.

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- Definition

Loans and receivables, interest rate

+ References

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of receivables related to finance leases.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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- Definition

The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than: (a) those that the entity intends to sell immediately or in the near term, which shall be classified as held for trading, and those that the entity, upon initial recognition, designates as at fair value through profit or loss; (b) those that the entity, upon initial recognition, designates as available for sale; or (c) those for which the holder may not recover substantially all of its initial investment, other than because of credit deterioration, which shall be classified as available for sale. An interest acquired in a pool of assets that are not loans or receivables (for example, an interest in a mutual fund or a similar fund) is not a loan or receivable. [Refer: Derivative financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
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- Definition

The amount of non-current loans and receivables. [Refer: Loans and receivables]

+ References

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-Note Expiry date 2018-01-01
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- Definition

The amount of services received in related party transactions. [Refer: Related parties [member]]

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