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SHARE-BASED PAYMENTS - ESOP Activity (Details) - Employee Stock Option Plan | 12 Months Ended
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Mar. 31, 2018 CAD ($) shares | Mar. 31, 2017 CAD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Options outstanding, beginning of year (in shares) | shares | 5,541,625 | 4,834,725
Granted (in shares) | shares | 2,044,900 | 2,073,600
Exercised (in shares) | shares | (1,246,575) | (1,029,725)
Forfeited (in shares) | shares | (184,425) | (336,975)
Options outstanding, end of year (in shares) | shares | 6,155,525 | 5,541,625
Exercisable (in shares) | shares | 1,744,125 | 1,483,450
Options outstanding, beginning of year | $ | $ 14.51 | $ 13.30
Granted | $ | 22.15 | 16.19
Exercised | $ | 12.58 | 12.25
Forfeited | $ | 18.52 | 14.50
Options outstanding, end of year | $ | 17.31 | 14.51
Exercisable | $ | $ 14.12 | $ 12.57

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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 2017-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_d&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of share options exercisable in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of share options forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_iii&doctype=Standard -URIDate 2017-03-09 + Details
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