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Consolidated Statements of Operations and Comprehensive (Loss) Income (CAD)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Consolidated Statements of Operations and Comprehensive (Loss) Income [Abstract]      
Revenue 1,006,545 858,048 758,965
Project costs 610,821 456,119 301,307
Equipment costs 220,738 234,933 209,408
Equipment operating lease expense 65,185 69,420 66,329
Depreciation 48,900 39,440 42,636
Gross profit 60,901 58,136 139,285
General and administrative expenses 54,400 59,828 62,516
Loss on disposal of property, plant and equipment 1,741 1,948 1,233
(Gain) loss on disposal of assets held for sale (note 12(b)) (466) 825 373
Amortization of intangible assets (note 12(c)) 5,702 3,540 1,719
Equity in (earnings) loss of unconsolidated joint venture (note 11) (86) 2,720 (44)
Operating (loss) income before the undernoted (390) (10,725) 73,488
Interest expense, net (note 19) 30,325 29,991 26,080
Foreign exchange loss (gain) 52 (1,659) (48,901)
Realized and unrealized (gain) loss on derivative financial instruments (note 21(a)) (2,382) (2,305) 54,411
Loss on debt extinguishment (note 15(d))   4,346  
(Loss) income before income taxes (28,385) (41,098) 41,898
Income tax (benefit) expense (note 17):      
Current (677) 2,892 3,803
Deferred (6,546) (9,340) 9,876
Net (loss) income (21,162) (34,650) 28,219
Other comprehensive income (loss)      
Unrealized foreign currency translation gain (loss) 40 (59)  
Comprehensive (loss) income (21,122) (34,709) 28,219
Net (loss) income per share - basic (note 18(b)) (0.58) (0.96) 0.78
Net (loss) income per share - diluted (note 18(b)) (0.58) (0.96) 0.77