Capital Stock (Tables)

12 Months Ended

Apr. 30, 2012

Number of Capital Stock and CPECs Issued

	Number of capital stock and CPECs issued
	Capital stock			CPECs
April 30, 2009		12,500			1,205,624,393
Conversion of series A CPECs		1,184,667,289			(1,184,667,289	)
Conversion of series B CPECs		15,375,200			(15,375,200	)
Conversion of series C CPECs		5,581,904			(5,581,904	)
Redemption of capital stock		(20,957,104	)		—
April 30, 2010		1,184,679,789			—
Capital stock		113,978			—
April 30, 2011		1,184,793,767			—
Capital stock		43,584,003			—
April 30, 2012		1,228,377,770			—