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EMPLOYEE COMPENSATION (Details) - CAD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Employee Benefits [Abstract]
Salaries and other short-term employee benefits	$ 908.2	$ 838.4
Share-based payments, net of equity swap	46.9	40.4
Post-employment benefits – defined benefit plans	31.1	30.8
Post-employment benefits – defined contribution plans	12.8	12.4
Termination benefits	5.6	11.2
Total employee compensation expense	$ 1,004.6	$ 933.2

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- Definition

Employee Benefits [Abstract]

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No definition available.

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- Definition

Expense From Share-based Payment Transactions With Employees, Net Of Equity Swap

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- Definition

The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

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- Definition

The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

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The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

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The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense]

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A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense]

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