Consolidated Statements of Shareholder's Equity (USD $)	Total	Capital stock	Contributed surplus	Deficit	Accumulated other comprehensive loss	Redeemable non- controlling interests
Beginning Balance at Apr. 30, 2012	$ 660,910,000	$ 5,000	$ 1,695,620,000	$ (973,119,000)	$ (61,596,000)	$ 1,675,000
Noncontrolling Interest in Variable Interest Entity						105,000
Net change in cash flow hedges	(169,000)				(169,000)
Foreign currency translation	19,580,000				19,580,000	(211,000)
Stock compensation expense	334,000		334,000
Defined benefit plan, net of income tax	(6,432,000)				(6,432,000)	(290,000)
Net earnings (loss)	(84,606,000)			(84,606,000)		(2,925,000)
Ending Balance at Jan. 31, 2013	589,617,000	5,000	1,695,954,000	(1,057,725,000)	(48,617,000)	(1,646,000)
Beginning Balance at Apr. 30, 2013	513,681,000	5,000	1,696,066,000	(1,092,555,000)	(89,835,000)	(8,262,000)
Issuance of capital stock (note 11)	289,140,000	3,000	289,137,000
Capital contribution by shareholder (note 2)						956,000
Foreign currency translation	(49,011,000)				(49,011,000)	(3,417,000)
Stock compensation expense	22,242,000		22,242,000
Defined benefit plan, net of income tax	421,000				421,000	625,000
Net earnings (loss)	(149,324,000)			(149,324,000)		4,486,000
Ending Balance at Jan. 31, 2014	$ 627,149,000	$ 8,000	$ 2,007,445,000	$ (1,241,879,000)	$ (138,425,000)	$ (5,612,000)