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INCOME TAXES (Details) - CAD ($)
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Canadian statutory income tax rates 26.85% 26.95%
Tax cuts and jobs act, change in tax rate $ 33,100,000  
Current period 53,800,000 $ 21,000,000
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised 2,113,600,000 1,990,400,000
Deductible temporary differences for which no deferred tax asset is recognised $ 243,500,000 292,600,000
Deductible temporary differences for which no deferred tax asset is recognised, period 30 years  
Accumulated capital losses for which no deferred tax asset is recognised $ 900,000 900,000
Accumulated other comprehensive income    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax expense (income) (11,700,000) 7,700,000
Current period $ 600,000 $ 0