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Capital Stock - Net loss per ordinary share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Equity [Abstract]
Continuing operations	$ (60,003)	$ (58,633)	$ (149,324)	$ (85,630)
Discontinued operations	$ 0	$ 212	$ 0	$ 1,024
Weighted average number of shares outstanding - basic and diluted:	51,573,832	46,519,484	48,204,267	46,519,484

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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