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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of revenue (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total Company | $ 2,533,288 | $ 3,032,883
Life Sciences |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total Company | 1,471,797 | 1,268,546
Food & Beverage |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total Company | 416,879 | 435,005
Consumer Products |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total Company | 335,690 | 287,228
Transportation |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total Company | 184,971 | 933,329
Energy |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total Company | 123,951 | 108,775
Goods and services transferred at a point in time |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total Company | 571,026 | 445,377
Goods and services transferred over time |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total Company | $ 1,962,262 | $ 2,587,506

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