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REVENUE FROM CONTRACTS WITH CUSTOMERS - Net contract assets and liabilities (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2025
CAD ($)
May 23, 2025
CAD ($)
May 23, 2025
USD ($)
Mar. 31, 2024
CAD ($)
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Costs incurred $ 4,443,488     $ 3,936,631
Estimated earnings 1,467,315     1,354,259
Contracts in progress 5,910,803     5,290,890
Progress billings (5,737,385)     (4,898,391)
Net contract assets and liabilities 173,418     $ 392,499
Decrease in contract asset (201,151)      
Increase in contract liability 17,930      
Decrease through impairment, contract assets 129,000      
Decrease through impairment, before income taxes, contract assets 171,090      
Reduction to revenues 146,900      
Increase to selling, general and administrative expenses $ 24,190      
Major purchases of assets [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Receivables from contracts with customers   $ 194,000 $ 134,750