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SHARE-BASED PAYMENTS - DSU Activity (Details) - Deferred Share Unit (DSU) | 12 Months Ended
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Mar. 31, 2018 shares | Mar. 31, 2017 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Units outstanding, beginning of year (in shares) | 691,698 | 701,205
Units granted (in shares) | 99,632 | 86,599
Units redeemed (in shares) | (143,560) | (107,524)
Dividends paid in units (in shares) | 27,327 | 11,418.0
Units outstanding, end of year (in shares) | 675,097 | 691,698
Units vested, end of year (in shares) | 675,097 | 691,698

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