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Other information (Details) (CAD)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Cash paid during the year for:      
Interest, including realized interest on interest rate swap 29,783 27,521 33,559
Income taxes 4,833 1,415 4,149
Cash received during the year for:      
Interest 10 1 1,168
Income taxes 518 5,347 2,260
Non-cash transactions:      
Acquisition of property, plant and equipment for continuing operations by means of capital leases 42,229 7,215 427
Additions to assets held for sale (2,995) (10,322) (1,675)
Decrease in property, plant and equipment resulting from reclassification to inventory (2,219) 0 0
Change in non-cash working capital related to piling discontinued operations, excluded from non-cash working capital for continuing operations:      
Accounts receivable, net 71,212 (1,819) (5,257)
Unbilled revenue 21,588 2,705 (17,354)
Inventories 3,215 (11,577) (930)
Prepaid expenses and deposits 3,720 3,464 5,810
Accounts payable (56,792) 56,629 (2,062)
Accrued liabilities (1,621) 2,167 (5,566)
Billings in excess of costs incurred and estimated earnings on uncompleted contracts 3,893 3,192 (607)
Operating activities:      
Long term portion of liabilities related to equipment leases (1,353) (9,578) (2,196)
Net changes in non-cash working capital 43,862 45,183 (28,162)
Buyout of contract related assets
      
Non-cash transactions related to the buyout of contract-related assets during the year ended March 31, 2012:      
Disposition of property, plant and equipment related to the buyout of contract-related assets 0 (27,063) 0
Disposition of intangible assets related to the buyout of contract-related assets 0 (1,119) 0
Increase in accounts receivable related to the buyout of contract-related assets 0 66,055 0
Decrease in unbilled revenue related to the buyout of contract-related assets 0 (16,457) 0
Decrease in inventory related to the buyout of contract-related assets 0 (8,483) 0
Increase in accounts payable related to the buyout of contract-related assets 0 12,933 0
Restricted share units (RSUs) | Restricted share unit plan
      
Non-cash transactions:      
(Decrease) increase in accrued liabilities related to current portion of RSU liability (1,347) 2,066 0
Deferred stock units (DSUs) | Directors' deferred share unit plan
      
Non-cash transactions:      
(Decrease) increase in accrued liabilities related to current portion of RSU liability 355 0 0
Purchase of property, plant and equipment
      
Non-cash transactions:      
Net increase (decrease) in accounts payable related to purchase of property, plant and equipment 4,294 1,380 (3,879)
Net decrease in current portion of equipment lease liabilities included in accrued liabilities related to the purchase of property, plant and equipment (1,574) 0 0
Net decrease in long term portion of equipment lease liabilities related to the purchase of property, plant and equipment (1,712) 0 0
Continuing operations
      
Non-cash transactions:      
Acquisition of property, plant and equipment for continuing operations by means of capital leases 42,229 6,614 427
Discontinued operations
      
Non-cash transactions:      
Acquisition of property, plant and equipment for continuing operations by means of capital leases 6,512 601 0
Additions to assets held for sale (152,470) 0 0
Additions to liabilities held for sale from discontinued piling operations 26,113 0 0
Change in non-cash working capital related to piling discontinued operations, excluded from non-cash working capital for continuing operations:      
Accounts receivable, net 1,849 17,773 4,277
Unbilled revenue 236 3,082 883
Inventories 3,900 1,026 1,731
Prepaid expenses and deposits (47) 51 5,502
Accounts payable 27,857 (14,135) (23,444)
Accrued liabilities 103 252 (132)
Billings in excess of costs incurred and estimated earnings on uncompleted contracts 1,207 (2,318) (997)