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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 |  |  |

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