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EMPLOYEE BENEFITS OBLIGATIONS - Expected Employer Contributions (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2022
CAD ($)
Expected employer contributions in funded plans  
Disclosure of defined benefit plans [line items]  
Expected employer contributions and expected benefits paid $ 28.6
Expected benefits paid in unfunded plans  
Disclosure of defined benefit plans [line items]  
Expected employer contributions and expected benefits paid 3.5
Canadian | Expected employer contributions in funded plans  
Disclosure of defined benefit plans [line items]  
Expected employer contributions and expected benefits paid 28.3
Canadian | Expected benefits paid in unfunded plans  
Disclosure of defined benefit plans [line items]  
Expected employer contributions and expected benefits paid 3.2
Foreign | Expected employer contributions in funded plans  
Disclosure of defined benefit plans [line items]  
Expected employer contributions and expected benefits paid 0.3
Foreign | Expected benefits paid in unfunded plans  
Disclosure of defined benefit plans [line items]  
Expected employer contributions and expected benefits paid $ 0.3