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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of revenue (Details) - CAD ($)
$ in Thousands
 12 Months Ended
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