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IMPAIRMENT OF NON-FINANCIAL ASSETS - Narrative (Details) - CAD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Disclosure of reconciliation of changes in goodwill [line items]      
Impairment loss recognised in profit or loss, intangible assets and goodwill   $ 51.8 $ 40.7
Discount rate increase 1.00% 1.00%  
Growth rate decrease 1.00% 1.00%  
Bottom of range      
Disclosure of reconciliation of changes in goodwill [line items]      
Growth rate used to extrapolate cash flow projections 2.00% 2.00%  
Discount rate used to calculate recoverable amounts 8.00% 8.00%  
Top of range      
Disclosure of reconciliation of changes in goodwill [line items]      
Growth rate used to extrapolate cash flow projections 3.00% 3.00%  
Discount rate used to calculate recoverable amounts 13.00% 13.00%  
Civil Aviation Training Solutions, Defense and Security and Healthcare      
Disclosure of reconciliation of changes in goodwill [line items]      
Growth rate used to extrapolate cash flow projections, period 5 years    
Civil Aviation Training Solutions, Defense and Security and Healthcare | Bottom of range      
Disclosure of reconciliation of changes in goodwill [line items]      
Growth rate used to extrapolate cash flow projections 2.00% 2.00%  
Civil Aviation Training Solutions, Defense and Security and Healthcare | Top of range      
Disclosure of reconciliation of changes in goodwill [line items]      
Growth rate used to extrapolate cash flow projections 3.00% 3.00%  
Healthcare      
Disclosure of reconciliation of changes in goodwill [line items]      
Impairment loss recognised in profit or loss, intangible assets and goodwill     37.5
Goodwill      
Disclosure of reconciliation of changes in goodwill [line items]      
Impairment loss recognised in profit or loss, intangible assets and goodwill   $ 0.0 37.5
Goodwill | Healthcare      
Disclosure of reconciliation of changes in goodwill [line items]      
Impairment loss recognised in profit or loss, intangible assets and goodwill     $ 37.5