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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2018
USD ($)
business_segments
Mar. 31, 2018
CAD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CAD ($)
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 | $ $ 4.0   $ 4.4  
Minimum finance lease payments payable $ 119.4 $ 201.8 $ 192.3 $ 240.4
Government royalties | Bottom of range        
Disclosure of detailed information about property, plant and equipment [line items]        
Growth rate used to extrapolate cash flow projections 6.00% 6.00%    
Discount rate used in current estimate of value in use 6.00% 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% 15.00%    
Discount rate used in current estimate of value in use 10.00% 10.00%    
Capitalized development costs | Bottom of range        
Disclosure of detailed information about property, plant and equipment [line items]        
Useful lives, intangible assets other than goodwill 5 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 10 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 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)      
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 10 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