Defined Contribution Plan, Employer Matching Contribution, Percent2

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Exercisable Options, Period

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Number Of Other Equity Instruments Vested And Outstanding In Share-Based Payment Arrangement, Granted Under Previous Plans

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Number of Days Prior To Incentive Compensation, Payable To Executives

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Percentage

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant1

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Weighted Average Share Price For Share Options In Share-Based Payment Arrangement Average Market Price, Granted During Period

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Weighted Average Share Price For Share Options In Share-based Payment Arrangement Average Market Price

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2018-01-01
-Paragraph 17
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SHARE-BASED PAYMENTS - Narrative (Details) - CAD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]
Allocation of recognized period costs, capitalized amount	$ 1.2	$ 0.8
Hedging expense (recovery), recognized	$ 44.0	$ (13.2)
Number of shares (in shares)	11,892,268	13,446,114
Exercisable options, period	4 years
Share-based payments expense	$ (8.8)	$ 18.9
Number of days prior to incentive compensation, payable to executives	20 days
Vesting period	3 years
Shares vested and outstanding, granted under previous plans (in shares)	1,044,359	1,067,648
Employee Stock Option Plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Weighted average market share price	$ 34.77	$ 27.11
Weighted average market share price, granted (in dollars per share)ket Price, Granted During Period	$ 4.98	$ 4.23
Employee Stock Purchase Plan (ESPP)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Employer matching contribution, matching, percentage	50.00%
Employer matching contribution, percent of employees' gross pay	3.00%
Restricted Share Unit Plan (RSU)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	33.00%
Top of range
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercisable options, period	7 years
Year 1 \| Performance Share Unit Plan (PSU)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period			1 year
Vesting period			16.00%
Year 2 \| Performance Share Unit Plan (PSU)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period		2 years
Vesting period		33.00%
Year 3 \| Performance Share Unit Plan (PSU)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	3 years
Vesting period	50.00%