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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
CAD ($)
Mar. 31, 2020
CAD ($)
business_segments
Mar. 31, 2019
CAD ($)
Mar. 31, 2018
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]            
Number of operating segments | business_segments   3        
Amortisation method, intangible assets other than goodwill     straight-line method        
Increase In royalty obligations, impact of 1% change in growth rate         $ 2.8 $ 3.5
Impairment of goodwill $ 37.5 $ 37.5 $ 0.0      
Bottom of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Expected warranty claims period   1 year        
Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Expected warranty claims period   7 years        
Government royalties | Bottom of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Growth rate used to extrapolate cash flow projections         8.00%  
Discount rate used in current estimate of value in use         6.00%  
Government royalties | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Growth rate used to extrapolate cash flow projections         15.00%  
Discount rate used in current estimate of value in use         9.50%  
Capitalized development costs | Bottom of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, intangible assets other than goodwill   3 years        
Capitalized development costs | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, intangible assets other than goodwill   10 years        
Customer relationships | Bottom of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, intangible assets other than goodwill   3 years        
Customer relationships | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, intangible assets other than goodwill   20 years        
ERP and other software | Bottom of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, intangible assets other than goodwill   3 years        
ERP and other software | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, intangible assets other than goodwill   10 years        
Technology | Bottom of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, intangible assets other than goodwill   3 years        
Technology | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, intangible assets other than goodwill   20 years        
Other intangible assets | Bottom of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, intangible assets other than goodwill   2 years        
Other intangible assets | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, intangible assets other than goodwill   40 years        
Buildings and improvements            
Disclosure of detailed information about property, plant and equipment [line items]            
Depreciation method, property, plant and equipment   Declining balance/Straight-line        
Buildings and improvements | Bottom of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Amortization rate, property, plant and equipment   2.50%        
Useful lives, property, plant and equipment   3 years        
Buildings and improvements | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Amortization rate, property, plant and equipment   10.00%        
Useful lives, property, plant and equipment   40 years        
Simulators            
Disclosure of detailed information about property, plant and equipment [line items]            
Depreciation method, property, plant and equipment   Straight-line (10% residual)        
Average remaining amortization period   12 years 11 years 1 month 6 days      
Simulators | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, property, plant and equipment   25 years        
Machinery and equipment            
Disclosure of detailed information about property, plant and equipment [line items]            
Depreciation method, property, plant and equipment   Declining balance/Straight-line        
Machinery and equipment | Bottom of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Amortization rate, property, plant and equipment   20.00%        
Useful lives, property, plant and equipment   2 years        
Machinery and equipment | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Amortization rate, property, plant and equipment   35.00%        
Useful lives, property, plant and equipment   15 years        
Aircraft            
Disclosure of detailed information about property, plant and equipment [line items]            
Depreciation method, property, plant and equipment   Straight-line (residual not exceeding 15%)        
Aircraft | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, property, plant and equipment   25 years        
Aircraft engines            
Disclosure of detailed information about property, plant and equipment [line items]            
Depreciation method, property, plant and equipment   Based on utilization        
Aircraft engines | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Utilization rate, property plant and equipment   3500 hours        
Capitalized development costs            
Disclosure of detailed information about property, plant and equipment [line items]            
Average remaining amortization period     5 years 2 months 12 days 5 years 2 months 12 days    
Goodwill | Bottom of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Growth rate used to extrapolate cash flow projections         2.00%  
Goodwill | Top of range            
Disclosure of detailed information about property, plant and equipment [line items]            
Growth rate used to extrapolate cash flow projections         3.00%  
Machinery and equipment            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, right of use assets   7 years        
Buildings and land            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, right of use assets   40 years        
Simulators            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful lives, right of use assets   25 years        
Aircraft            
Disclosure of detailed information about property, plant and equipment [line items]            
Undiscounted lease rental payments     $ 46.6