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SHARE CAPITAL, EARNINGS PER SHARE AND DIVIDENDS (Details) - CAD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Feb. 09, 2018
Earnings per share [line items] |  |  |
Number of shares authorized to be repurchased renewal, shares |  |  | 5,349,804
Stock repurchased and retired during period, shares | 2,081,200 | 2,490,900 |
Stock repurchased and retired during period, per shares | $ 21.53 | $ 16.73 |
Repurchase of common shares | $ 44.8 | $ 41.7 |
Number of shares issued and fully paid, shares | 267,738,530 | 268,397,224 |
Antidilutive securities excluded from computation of earnings per share, shares | 1,941,200 | 46,700 |
Dividends | $ 93.9 | $ 84.6 |
Dividends (in CAD per share) | $ 0.35 | $ 0.315 |
Private Share Repurchase Agreement |  |  |
Earnings per share [line items] |  |  |
Stock repurchased and retired during period, shares | 600,000 |  |
Retained earnings |  |  |
Earnings per share [line items] |  |  |
Repurchase of common shares | $ (39.9) | $ (36.1) |

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