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LEASES - Schedule of Right-Of-Use Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance $ 426.9 $ 373.0
Additions and remeasurements 177.2 128.2
Disposal of discontinued operations (Note 2) (9.8)  
Depreciation (53.5) (50.1)
Impairment (1.3)  
Purchase of assets under lease (Note 13)   (34.6)
Transfers and others 5.5 (8.7)
Foreign currency exchange differences 0.8 19.1
Right-of-use assets, ending balance 545.8 426.9
Discontinued operations    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation (0.6) (1.0)
Cost of sales    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation (51.4) (47.5)
Selling, general and administrative expense    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation (1.5) (1.6)
Buildings and land    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 346.7 255.3
Additions and remeasurements 168.0 120.9
Disposal of discontinued operations (Note 2) (9.8)  
Depreciation (39.9) (36.6)
Impairment (1.3)  
Purchase of assets under lease (Note 13)   0.0
Transfers and others 9.3 (6.1)
Foreign currency exchange differences 0.9 13.2
Right-of-use assets, ending balance 473.9 346.7
Simulators    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 56.9 90.5
Additions and remeasurements 8.7 7.3
Disposal of discontinued operations (Note 2) 0.0  
Depreciation (9.8) (9.9)
Impairment 0.0  
Purchase of assets under lease (Note 13)   (34.6)
Transfers and others (3.8) (2.3)
Foreign currency exchange differences (0.1) 5.9
Right-of-use assets, ending balance 51.9 56.9
Machinery and equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 12.4 15.5
Additions and remeasurements 0.5 0.0
Disposal of discontinued operations (Note 2) 0.0  
Depreciation (3.0) (2.8)
Impairment 0.0  
Purchase of assets under lease (Note 13)   0.0
Transfers and others 0.0 (0.3)
Foreign currency exchange differences 0.0 0.0
Right-of-use assets, ending balance 9.9 12.4
Aircraft    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 10.9 11.7
Additions and remeasurements 0.0 0.0
Disposal of discontinued operations (Note 2) 0.0  
Depreciation (0.8) (0.8)
Impairment 0.0  
Purchase of assets under lease (Note 13)   0.0
Transfers and others 0.0 0.0
Foreign currency exchange differences 0.0 0.0
Right-of-use assets, ending balance $ 10.1 $ 10.9