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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Narrative (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |  |
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Mar. 31, 2025 CAD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 CAD ($) | Mar. 31, 2024 USD ($) | Dec. 05, 2024 CAD ($) | Dec. 05, 2024 EUR (€) | Nov. 21, 2023 CAD ($) | Mar. 31, 2023 CAD ($) | Nov. 04, 2022 CAD ($) | Apr. 20, 2022 EUR (€) | Apr. 20, 2022 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 225,947 |  | $ 170,177 |  |  |  |  | $ 159,867 |  |  |
Credit Facility |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities | 683,535 |  | 447,339 |  |  |  |  |  |  |  |
Currency risk |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Effect on accumulated other comprehensive income | 14,148 | $ 34,635 | 8,602 | $ 36,925 |  |  |  |  |  |  |
Effect on income before income taxes | $ 7,291 | $ 13,978 | 1,679 | $ 6,934 |  |  |  |  |  |  |
Reasonably possible change in risk variable, percent | 5.00% |  |  |  |  |  |  |  |  |  |
Interest rate risk |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Effect on income before income taxes | $ 4,795 |  | 4,084 |  |  |  |  |  |  |  |
Debt subject to movements | $ 479,519 |  | $ 408,420 |  |  |  |  |  |  |  |
Debt subject to movements, percentage | 30.00% |  | 34.00% |  |  |  |  |  |  |  |
Reasonably possible change in risk variable, percent | 1.00% |  |  |  |  |  |  |  |  |  |
Forward contract |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Risk management gains (losses) | $ (24,117) |  | $ 5,448 |  |  |  |  |  |  |  |
Unrealized gains (losses) | (6,823) |  | 3,146 |  |  |  |  |  |  |  |
Realized gains (losses) | (17,294) |  | 2,302 |  |  |  |  |  |  |  |
Cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Income recognized | $ (1,502) |  | $ 345 |  |  |  |  |  |  |  |
Cash flow hedges | Interest rate swap instrument |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | € 161,142 | $ 175
US interest rate received |  |  |  |  |  |  |  |  |  | 4.125% | 4.125%
Canadian interest rate paid |  |  |  |  |  |  |  |  |  | 4.169% | 4.169%
Canadian interest rate received |  |  |  |  |  |  |  |  |  | 4.169% | 4.169%
Euro interest rate paid |  |  |  |  |  |  |  |  |  | 2.351% | 2.351%
Cash flow hedges | Variable fixed interest rate swap instrument |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 300 |  | $ 300 |  |
Derivatives, interest rate fixed |  |  |  |  |  |  | 4.044% |  | 4.241% |  |
Foreign exchange risk related to senior notes | Cross-currency interest rate swap instrument |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 175 |  |  |  |  |  |
Derivatives, interest rate received |  |  |  |  | 4.125% | 4.125% |  |  |  |  |
Derivatives, interest rate paid |  |  |  |  | 4.169% | 4.169% |  |  |  |  |
Foreign exchange risk related to senior notes | Senior Notes | Settled | Cross-currency interest rate swap instrument |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 175 |  |  |  |  |  |
Derivatives, interest rate received |  |  |  |  | 4.125% | 4.125% |  |  |  |  |
Derivatives, interest rate paid |  |  |  |  | 3.128% | 3.128% |  |  |  |  |
Net investment in european operations | Cross-currency interest rate swap instrument |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  | € 161,142 |  |  |  |  |
Derivatives, interest rate received |  |  |  |  | 4.169% | 4.169% |  |  |  |  |
Derivatives, interest rate paid |  |  |  |  | 2.351% | 2.351% |  |  |  |  |
Net investment in european operations | Entered Into | Cross-currency interest rate swap instrument |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  | € 165,328 |  |  |  |  |
Derivatives, interest rate received |  |  |  |  | 3.128% | 3.128% |  |  |  |  |
Derivatives, interest rate paid |  |  |  |  | 2.645% | 2.645% |  |  |  |  |

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