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COMMITMENTS (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]    
Expected future minimum lease payments payable under non-cancellable operating lease $ 240.0 $ 262.9
Rental expense 68.2 72.5
Contractual capital commitments 223.2 239.1
No later than 1 year    
Disclosure of finance lease and operating lease by lessee [line items]    
Expected future minimum lease payments payable under non-cancellable operating lease 44.4 55.3
Contractual capital commitments 132.0 118.4
Later than 1 year and no later than 5 years    
Disclosure of finance lease and operating lease by lessee [line items]    
Expected future minimum lease payments payable under non-cancellable operating lease 118.9 125.6
Contractual capital commitments 90.7 119.0
Later than 5 years    
Disclosure of finance lease and operating lease by lessee [line items]    
Expected future minimum lease payments payable under non-cancellable operating lease 76.7 82.0
Contractual capital commitments $ 0.5 $ 1.7