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DEBT FACILITIES - Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning $ 3,074.3 $ 3,250.1
Net repayment from borrowing under revolving credit facilities (45.0) (396.7)
Proceeds from long-term debt 331.5 433.5
Repayment of long-term debt (321.3) (370.4)
Repayment of lease liabilities (59.9) (69.5)
Total changes from financing cash flows (94.7) (403.1)
Foreign currency exchange differences 146.1 (5.9)
Additions and remeasurements of lease liabilities 153.4 177.2
Disposal of discontinued operations / Business combinations 158.5 (12.2)
Accretion 32.5 27.9
Transfer from royalty obligations (Note 3)   36.9
Other 0.3 3.4
Total non-cash changes 490.8 227.3
Liabilities arising from financing activities, end 3,470.4 3,074.3
Unsecured senior notes    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning 1,678.3 1,300.7
Net repayment from borrowing under revolving credit facilities 0.0 0.0
Proceeds from long-term debt 0.0 397.1
Repayment of long-term debt (216.1) (21.7)
Repayment of lease liabilities 0.0 0.0
Total changes from financing cash flows (216.1) 375.4
Foreign currency exchange differences 78.1 1.2
Additions and remeasurements of lease liabilities 0.0 0.0
Disposal of discontinued operations / Business combinations 0.0 0.0
Accretion 0.0 0.0
Transfer from royalty obligations (Note 3)   0.0
Other 1.1 1.0
Total non-cash changes 79.2 2.2
Liabilities arising from financing activities, end 1,541.4 1,678.3
Term loans    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning 239.9 564.4
Net repayment from borrowing under revolving credit facilities 0.0 0.0
Proceeds from long-term debt 285.8 0.0
Repayment of long-term debt (72.6) (324.0)
Repayment of lease liabilities 0.0 0.0
Total changes from financing cash flows 213.2 (324.0)
Foreign currency exchange differences 16.3 (1.3)
Additions and remeasurements of lease liabilities 0.0 0.0
Disposal of discontinued operations / Business combinations 48.5 0.0
Accretion 0.0 0.0
Transfer from royalty obligations (Note 3)   0.0
Other 0.8 0.8
Total non-cash changes 65.6 (0.5)
Liabilities arising from financing activities, end 518.7 239.9
Lease liabilities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning 551.9 455.9
Net repayment from borrowing under revolving credit facilities 0.0 0.0
Proceeds from long-term debt 0.0 0.0
Repayment of long-term debt 0.0 0.0
Repayment of lease liabilities (59.9) (69.5)
Total changes from financing cash flows (59.9) (69.5)
Foreign currency exchange differences 36.7 0.5
Additions and remeasurements of lease liabilities 153.4 177.2
Disposal of discontinued operations / Business combinations 110.0 (12.2)
Accretion 0.0 0.0
Transfer from royalty obligations (Note 3)   0.0
Other 0.0 0.0
Total non-cash changes 300.1 165.5
Liabilities arising from financing activities, end 792.1 551.9
R&D obligations    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning 574.2 496.1
Net repayment from borrowing under revolving credit facilities 0.0 0.0
Proceeds from long-term debt 45.7 36.4
Repayment of long-term debt (32.6) (24.7)
Repayment of lease liabilities 0.0 0.0
Total changes from financing cash flows 13.1 11.7
Foreign currency exchange differences 0.0 0.0
Additions and remeasurements of lease liabilities 0.0 0.0
Disposal of discontinued operations / Business combinations 0.0 0.0
Accretion 32.5 27.9
Transfer from royalty obligations (Note 3)   36.9
Other (1.6) 1.6
Total non-cash changes 30.9 66.4
Liabilities arising from financing activities, end 618.2 574.2
Revolving credit facilities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning 30.0 433.0
Net repayment from borrowing under revolving credit facilities (45.0) (396.7)
Proceeds from long-term debt 0.0 0.0
Repayment of long-term debt 0.0 0.0
Repayment of lease liabilities 0.0 0.0
Total changes from financing cash flows (45.0) (396.7)
Foreign currency exchange differences 15.0 (6.3)
Additions and remeasurements of lease liabilities 0.0 0.0
Disposal of discontinued operations / Business combinations 0.0 0.0
Accretion 0.0 0.0
Transfer from royalty obligations (Note 3)   0.0
Other 0.0 0.0
Total non-cash changes 15.0 (6.3)
Liabilities arising from financing activities, end $ 0.0 $ 30.0