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Property, plant and equipment (Details) (CAD)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Property, Plant and Equipment [Line Items]      
Cost 459,147 526,272  
Accumulated Deprecation 184,901 213,497  
Net Book Value 274,246 312,775  
Acquisition of property, plant and equipment for continuing operations by means of capital leases 42,229 7,215 427
Heavy equipment
      
Property, Plant and Equipment [Line Items]      
Cost 259,711 347,699  
Accumulated Deprecation 96,046 124,982  
Net Book Value 163,665 222,717  
Major component parts in use
      
Property, Plant and Equipment [Line Items]      
Cost 58,763 74,444  
Accumulated Deprecation 23,512 28,741  
Net Book Value 35,251 45,703  
Other equipment
      
Property, Plant and Equipment [Line Items]      
Cost 25,193 35,736  
Accumulated Deprecation 9,970 17,017  
Net Book Value 15,223 18,719  
Licensed motor vehicles
      
Property, Plant and Equipment [Line Items]      
Cost 28,862 27,120  
Accumulated Deprecation 22,996 19,775  
Net Book Value 5,866 7,345  
Office and computer equipment
      
Property, Plant and Equipment [Line Items]      
Cost 13,931 13,438  
Accumulated Deprecation 11,488 8,977  
Net Book Value 2,443 4,461  
Buildings
      
Property, Plant and Equipment [Line Items]      
Cost 4,015 4,355  
Accumulated Deprecation 2,943 3,235  
Net Book Value 1,072 1,120  
Land
      
Property, Plant and Equipment [Line Items]      
Cost   281  
Accumulated Deprecation   0  
Net Book Value   281  
Leasehold improvements
      
Property, Plant and Equipment [Line Items]      
Cost 9,512 6,620  
Accumulated Deprecation 5,682 2,232  
Net Book Value 3,830 4,388  
Assets under capital lease
      
Property, Plant and Equipment [Line Items]      
Cost 59,160 16,579  
Accumulated Deprecation 12,264 8,538  
Net Book Value 46,896 8,041  
Depreciation expense 8,554 1,935 2,535