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LEASES - Schedule of Right-Of-Use Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance $ 545.8 $ 426.9
Additions and remeasurements 153.4 177.2
Business combinations (Note 2) 128.4  
Disposal of discontinued operations (Note 3)   (9.8)
Depreciation (65.3) (53.5)
Impairment (0.7) (1.3)
Purchase of assets under lease (Note $14) (9.1)  
Transfers and others (0.2) 5.5
Foreign currency exchange differences 35.7 0.8
Right-of-use assets, ending balance 788.0 545.8
Buildings and land    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 473.9 346.7
Additions and remeasurements 135.4 168.0
Business combinations (Note 2) 22.4  
Disposal of discontinued operations (Note 3)   (9.8)
Depreciation (45.8) (39.9)
Impairment (0.7) (1.3)
Purchase of assets under lease (Note $14) 0.0  
Transfers and others (0.9) 9.3
Foreign currency exchange differences 29.0 0.9
Right-of-use assets, ending balance 613.3 473.9
Simulators    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 51.9 56.9
Additions and remeasurements 0.0 8.7
Business combinations (Note 2) 106.0  
Disposal of discontinued operations (Note 3)   0.0
Depreciation (13.3) (9.8)
Impairment 0.0 0.0
Purchase of assets under lease (Note $14) 0.0  
Transfers and others 0.0 (3.8)
Foreign currency exchange differences 6.5 (0.1)
Right-of-use assets, ending balance 151.1 51.9
Machinery and equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 9.9 12.4
Additions and remeasurements 18.0 0.5
Business combinations (Note 2) 0.0  
Disposal of discontinued operations (Note 3)   0.0
Depreciation (5.2) (3.0)
Impairment 0.0 0.0
Purchase of assets under lease (Note $14) 0.0  
Transfers and others 0.7 0.0
Foreign currency exchange differences 0.2 0.0
Right-of-use assets, ending balance 23.6 9.9
Aircraft    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 10.1 10.9
Additions and remeasurements 0.0 0.0
Business combinations (Note 2) 0.0  
Disposal of discontinued operations (Note 3)   0.0
Depreciation (1.0) (0.8)
Impairment 0.0 0.0
Purchase of assets under lease (Note $14) (9.1)  
Transfers and others 0.0 0.0
Foreign currency exchange differences 0.0 0.0
Right-of-use assets, ending balance $ 0.0 $ 10.1