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DEBT FACILITIES - Narrative (Details) € in Millions, $ in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 09, 2020 CAD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 CAD ($) | Mar. 31, 2020 CAD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Repayment of long-term debt |  | $ 50.0 | $ 86.1 | $ 233.0 |  |
Unsecured revolving credit facility, years | 2 years |  |  |  |  |
R&D Obligations |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Undrawn borrowing facilities |  |  | $ 38.5 | $ 86.3 |  |
Revolving Unsecured Term Credit Facility, September 2023 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 850.0 |
Term Loan, Maturing 2026 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount | € |  |  |  |  |  | € 31.7
USD $50 Million Term Loan Maturing 2022 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  |  |  |  | $ 50.0 |
Two-Year Unsecured Revolving Credit Facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 500.0 |  |  |  |  |

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