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BANK INDEBTEDNESS AND LONG-TERM DEBT - Narrative (Details) € in Thousands, ฿ in Thousands, £ in Thousands, $ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |  |  |
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Mar. 31, 2025 CAD ($) | Mar. 31, 2025 EUR (€) | Mar. 31, 2025 USD ($) | Mar. 31, 2025 THB (฿) | Mar. 31, 2025 GBP (£) | Mar. 31, 2025 AUD ($) | Dec. 20, 2024 CAD ($) | Dec. 19, 2024 CAD ($) | Aug. 21, 2024 CAD ($) | Mar. 31, 2024 CAD ($) | Oct. 05, 2023 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 1,543,678,000 |  |  |  |  |  |  |  |  | $ 1,171,972,000 |
Letters of credit | 279,383,000 |  |  |  |  |  |  |  |  | 171,065,000 |
Current borrowings | 27,271,000 |  |  |  |  |  |  |  |  | 4,060,000 |
Credit Facility |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Utilized amount | 452,248,000 |  |  |  |  |  |  |  |  |  |
Letters of credit | $ 0 |  |  |  |  |  |  |  |  | 12,000 |
Credit Facility | Bottom of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit usage fee, percentage | 1.45% | 1.45% | 1.45% | 1.45% | 1.45% | 1.45% |  |  |  |  |
Borrowings usage fee, percentage | 0.97% | 0.97% | 0.97% | 0.97% | 0.97% | 0.97% |  |  |  |  |
Standby fee, percentage | 0.29% | 0.29% | 0.29% | 0.29% | 0.29% | 0.29% |  |  |  |  |
Credit Facility | Bottom of range | Prime Rate |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis | 0.45% | 0.45% | 0.45% | 0.45% | 0.45% | 0.45% |  |  |  |  |
Credit Facility | Bottom of range | SOFR, EURIBOR or SONIA Rate |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis | 1.45% | 1.45% | 1.45% | 1.45% | 1.45% | 1.45% |  |  |  |  |
Credit Facility | Top of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit usage fee, percentage | 3.00% | 3.00% | 3.00% | 3.00% | 3.00% | 3.00% |  |  |  |  |
Borrowings usage fee, percentage | 2.00% | 2.00% | 2.00% | 2.00% | 2.00% | 2.00% |  |  |  |  |
Standby fee, percentage | 0.60% | 0.60% | 0.60% | 0.60% | 0.60% | 0.60% |  |  |  |  |
Credit Facility | Top of range | Prime Rate |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis | 2.00% | 2.00% | 2.00% | 2.00% | 2.00% | 2.00% |  |  |  |  |
Credit Facility | Top of range | SOFR, EURIBOR or SONIA Rate |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis | 3.00% | 3.00% | 3.00% | 3.00% | 3.00% | 3.00% |  |  |  |  |
Credit Facility | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 452,248,000 |  |  |  |  |  |  |  |  | 703,972,000 |
Secured Committed Revolving Line of Credit |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 750,000
Secured Term Credit Facility |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 300,000
Other Facilities , Including Bank Indebtedness | Bottom of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 3.10% | 3.10% | 3.10% | 3.10% | 3.10% | 3.10% |  |  |  |  |
Other Facilities , Including Bank Indebtedness | Top of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 8.40% | 8.40% | 8.40% | 8.40% | 8.40% | 8.40% |  |  |  |  |
Other Facilities , Including Bank Indebtedness | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 29,400,000 |  |  |  |  |  |  |  |  |  |
Letters of credit | 0 |  |  |  |  |  |  |  |  | 376,000 |
Additional credit facilities available | 115,183,000 |  |  |  |  |  |  |  |  |  |
Euro Credit Facility | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Additional credit facilities available | € |  | € 40,059 |  |  |  |  |  |  |  |  |
U.S. Credit Facility | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Additional credit facilities available |  |  | $ 24,000 |  |  |  |  |  |  |  |
Thai Baht Credit Facility | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Additional credit facilities available | ฿ |  |  |  | ฿ 120,000 |  |  |  |  |  |  |
British Pound Sterling Credit Facility | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Additional credit facilities available | £ |  |  |  |  | £ 5,000 |  |  |  |  |  |
Yuan Credit Facility | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Additional credit facilities available | £ |  |  |  |  | £ 5,000 |  |  |  |  |  |
Australian Credit Facility | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Additional credit facilities available |  |  |  |  |  | $ 1,000 |  |  |  |  |
Canadian Credit Facility | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Additional credit facilities available | 2,038,000 |  |  |  |  |  |  |  |  |  |
Other Facilities | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 2,129,000 |  |  |  |  |  |  |  |  | 2,299,000 |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 350,000 |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 4.125% | 4.125% | 4.125% | 4.125% | 4.125% | 4.125% |  |  |  |  |
Borrowings, redemption price, percentage | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% |  |  |  |  |
Borrowing costs incurred | $ 8,100 |  |  |  |  |  |  |  |  |  |
Senior Notes | Gross carrying amount |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 1,104,740,000 |  |  |  |  |  |  |  |  | $ 474,075,000 |
CAD Senior Notes |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 600,000 | $ 200,000 | $ 400,000 |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 6.50% |  |
Borrowings, redemption price, percentage |  |  |  |  |  |  |  | 101.00% |  |  |
Borrowing costs incurred | $ 9,604 |  |  |  |  |  |  |  |  |  |
Borrowings, premium |  |  |  |  |  |  | $ 1,250,000 |  |  |  |

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