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SHARE-BASED PAYMENTS - Narrative (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2019
CAD ($)
Retirement_Plan
$ / shares
shares
Mar. 31, 2018
CAD ($)
$ / shares
shares
Mar. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Allocation of recognized period costs, capitalized amount | $ $ 0.8 $ 0.4  
Subscription price, percentage 100.00%    
Not exercisable options, grant date, period 12 months    
Exercisable options, grant date, period 4 years    
Share-based payments | $ $ 18.9 $ 17.8  
Employee Stock Option Plan      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of shares (in shares) | shares 13,446,114 14,677,714  
Weighted average market share price | $ / shares $ 27.11 $ 22.15  
Share-based payments | $ $ 6.4 $ 4.9  
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%    
Executive Deferred Share Unit (EDSU)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of days prior to incentive compensation, payable to executives 5 days    
Value of executive deferred share unit (edsu), shares | shares 1    
Deferred Share Unit (DSU)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Value of deferred share unit (dsu), shares | shares 1    
Number of days prior to issuance of deferred shares units 10 days    
Long Term Incentive Time Based Plan      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of long-term incentive time based plans | Retirement_Plan 2    
Value of long-term incentive time based plans, shares (in shares) | shares 1    
Number of long-term incentive time based plans no longer granted | Retirement_Plan 1    
Long-Term Incentive – Deferred Share Unit Plan (LTI-DSU)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period 5 years    
Long-Term Incentive – Time Based Restricted Share Unit Plan (LTI-TB RSU)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period 3 years    
Long-Term Incentive – Restricted Share Unit Plan (LTI-RSU)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period 33.00%    
Long-Term Incentive – Performance Share Unit Plan (LTI-PSU)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period 3 years    
Equity swap agreements      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Hedging recovery, recognized | $ $ 13.2 $ 8.0  
Top of range      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Exercisable options, period 7 years    
Top of range | Long-Term Incentive – Performance Share Unit Plan (LTI-PSU)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Performance criteria, percentage 200.00%    
Bottom of range | Long-Term Incentive – Performance Share Unit Plan (LTI-PSU)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Performance criteria, percentage 0.00%    
Year 1 | Long-Term Incentive – Performance Share Unit Plan (LTI-PSU)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period     1 year
Vesting period     16.00%
Year 2 | Long-Term Incentive – Performance Share Unit Plan (LTI-PSU)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period   2 years  
Vesting period   33.00%  
Year 3 | Long-Term Incentive – Performance Share Unit Plan (LTI-PSU)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period 3 years    
Vesting period 50.00%