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Discontinued operations (Details) (CAD)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Mar. 31, 2013
reportable_segment
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2013
Pipeline
Mar. 31, 2012
Pipeline
Mar. 31, 2011
Pipeline
Nov. 22, 2012
Pipeline
Mar. 31, 2013
Piling
Mar. 31, 2012
Piling
Mar. 31, 2011
Piling
Jun. 30, 2013
Piling
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Number of reportable business segments 2                    
Total consideration received upon disposal             16,250       227,500
Selling costs of disposal group             781        
Net proceeds of disposal group             15,469        
Book value of disposed assets                      
Accounts receivable, net               44,297      
Unbilled revenue               9,324      
Inventory             1,254 7,754      
Prepaid expenses               181      
Intangible assets               4,220      
Property, plant and equipment, gross             17,491 83,359      
Accumulated depreciation             (5,459) (29,566)      
Goodwill               32,901      
Deferred tax assets               2,270      
Pipeline related assets             13,286        
Assets held for sale               154,740      
Results of discontinued operations                      
Revenue       35,901 150,504 85,452   236,459 185,321 105,559  
Project costs       36,090 164,278 87,703   172,593 136,080 84,175  
Equipment operating lease expense               2,315 2,315 1,071  
Depreciation       196 1,045 550   3,592 3,213 3,828  
Gross profit (loss)       (385) (14,819) (2,801)   57,959 43,713 16,485  
General and administrative expenses       1,246 1,371 1,449   12,451 11,696 9,654  
Amortization of intangible assets               1,408 1,415 1,390  
Gain on disposal of property, plant and equipment       (375) 0 0          
Recovery of previously expensed tools, supplies and equipment parts       (1,095) 0 0          
Gain on sale of inventory       (714) 0 0          
Operating Income (loss)       553 (16,190) (4,250)   44,100 30,602 5,441  
Interest expense       700 1,050 1,050   7,639 7,129 6,408  
Loss before income taxes       (147) (17,240) (5,300)   36,461 23,473 (967)  
Deferred income tax expense (benefit)       173 (4,282) (1,389)   9,295 6,294 46  
Net loss from discontinued operations       (320) (12,958) (3,911)   27,166 17,179 (1,013)  
Cash provided by (used in) the discontinued operations                      
Operating activities 38,191 6,175 11,681 928 (16,195) (4,750)   37,263 22,370 16,431  
Investing activities (22,061) (12,294) (27,322) 11,986 (4,110) (1,124)   (34,047) (8,184) (26,198)  
Financing activities (848) (337) 0         (848) (337) 0  
Total cash provided by (used in) discontinued operations 15,282 (6,456) (15,641) 12,914 (20,305) (5,874)   2,368 13,849 (9,767)  
Additional entitlement contingent on purchaser achieving profit milestones from assets sold                     92,500
Additional entitlement contingency period                     3 years
Book value of disposed liabilities                      
Accounts payable               17,048      
Accrued liabilities               23      
Billings in excess               3,115      
Capital lease obligation               5,927      
Deferred tax liabilities               12,733      
Liabilities held for sale 38,846 0           38,846