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Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (27,404)	$ (54,463)	$ (77,592)
Other comprehensive income (loss), net of taxes:
Unrealized loss resulting from changes in fair value of derivative instruments	(36)	(2,910)	(1,749)
Realized loss (gain) on derivative instruments reclassified into earnings	655	4,247	(578)
Unrealized gain (loss) resulting from changes in fair value of marketable securities	12	23	(3)
Other comprehensive income (loss)	631	1,360	(2,330)
Comprehensive loss	(26,773)	(53,103)	(79,922)
Less: Comprehensive loss attributable to noncontrolling interests	(4,309)	(321)	(6)
Comprehensive loss attributable to common stockholders	$ (22,464)	$ (52,782)	$ (79,916)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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