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SHARE-BASED PAYMENTS - ESOP Activity (Details) - Employee Stock Option Plan | 12 Months Ended
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Mar. 31, 2019 CAD ($) shares | Mar. 31, 2018 CAD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Options outstanding, beginning of year (in shares) | shares | 6,155,525 | 5,541,625
Granted (in shares) | shares | 1,733,100 | 2,044,900
Exercised (in shares) | shares | (1,231,600) | (1,246,575)
Forfeited (in shares) | shares | (82,525) | (184,425)
Expired (in shares) | shares | (70,375) | 0
Options outstanding, end of year (in shares) | shares | 6,504,125 | 6,155,525
Exercisable (in shares) | shares | 2,082,325 | 1,744,125
Options outstanding, beginning of year | $ | $ 17.31 | $ 14.51
Granted | $ | 27.15 | 22.15
Exercised | $ | 14.78 | 12.58
Forfeited | $ | 17.41 | 18.52
Expired | $ | 18.20 | 0.00
Options outstanding, end of year | $ | 20.41 | 17.31
Exercisable | $ | $ 16.36 | $ 14.12

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_d&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2018-03-16 + Details
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