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SHARE-BASED PAYMENTS - LTI Activity (Details) | 12 Months Ended
--- | ---
Mar. 31, 2018 shares | Mar. 31, 2017 shares
Long-Term Incentive – Deferred Share Unit Plan (LTI-DSU) |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Units outstanding, beginning of year (in shares) | 1,193,723 | 1,342,075
Units granted (in shares) | 0 | 0
Units cancelled (in shares) | (1,768) | (13,246)
Units redeemed (in shares) | (74,783) | (156,072)
Dividends paid in units (in shares) | 17,569 | 20,966
Units outstanding, end of year (in shares) | 1,134,741.000000 | 1,193,723
Units vested, end of year (in shares) | 1,128,464 | 1,177,529
Long-Term Incentive – Time Based Restricted Share Unit Plan (LTI-TB RSU) |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Units outstanding, beginning of year (in shares) | 551,210.00000 | 385,880
Units granted (in shares) | 179,440 | 211,030
Units cancelled (in shares) | (21,640) | (42,090)
Units redeemed (in shares) | (155,087) | (3,610)
Dividends paid in units (in shares) | 0 | 0
Units outstanding, end of year (in shares) | 553,923.000000 | 551,210.00000
Units vested, end of year (in shares) | 420,247 | 400,183

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