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INVENTORIES - Summary of Inventories (Details) - CAD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2017
Inventories [Abstract]
Work in progress	$ 342.4	$ 353.0
Raw materials, supplies and manufactured products	194.6	163.1
Inventories	$ 537.0	$ 516.1	$ 549.0	$ 549.0

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Inventories [Abstract]

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A classification of current inventory representing the amount of current raw materials and current production supplies. [Refer: Current production supplies; Current raw materials]

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The amount of current inventories. [Refer: Inventories]

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A classification of current inventory representing the amount of assets currently in production, which require further processes to be converted into finished goods or services. [Refer: Current finished goods; Inventories]

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