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Consolidated Statements of Operations and Comprehensive Loss (CAD)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Income Statement [Abstract]      
Revenue 544,609 670,720 667,037
Project costs 244,444 310,463 284,241
Equipment costs 193,843 220,738 234,933
Equipment operating lease expense 34,723 62,870 68,349
Depreciation 37,722 44,642 35,062
Gross profit 33,877 32,007 44,452
General and administrative expenses 44,076 41,333 48,725
Loss on disposal of property, plant and equipment 2,628 1,741 1,948
Loss (gain) on disposal of assets held for sale (note 10) 98 (466) 825
Amortization of intangible assets (note 13(b)) 3,694 4,287 2,150
Equity in (earnings) loss of unconsolidated joint venture (note 9) (596) (86) 2,720
Operating (loss) income before the undernoted (16,023) (14,802) (11,916)
Interest expense (note 22) 23,743 22,146 22,533
Foreign exchange loss (gain) 84 52 (1,659)
Unrealized gain on derivative financial instruments (note 17(a)) (2,705) (2,382) (2,305)
Loss on debt extinguishment (note 16(d)) 0 0 4,346
Loss from continuing operations before income taxes (37,145) (34,618) (34,831)
Income tax (note 11):      
Current (benefit) expense (2,209) (677) 2,892
Deferred (benefit) (6,627) (8,558) (7,997)
Net loss from continuing operations (28,309) (25,383) (29,726)
Income (loss) from discontinued operations, net of tax (note 23) 26,846 4,221 (4,924)
Net loss (1,463) (21,162) (34,650)
Other comprehensive income (loss)      
Unrealized foreign currency translation gain (loss) 31 40 (59)
Comprehensive loss (1,432) (21,122) (34,709)
Per share information (note 19(b))      
Net loss from continuing operations - basic and diluted (CAD per share) (0.78) (0.70) (0.82)
Net income (loss) from discontinued operations - basic and diluted (CAD per share) 0.74 0.12 (0.14)
Net loss - basic and diluted (CAD per share) (0.04) (0.58) (0.96)