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Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (11,033)	$ (11,474)	$ (11,771)	$ (40,946)
Other comprehensive income (loss), net of taxes:
Unrealized income (loss) resulting from changes in fair value of derivative instruments	533	(11)	(35)	(2,810)
Realized loss on derivative instruments reclassified into earnings	310	149	655	4,139
Unrealized (loss) gain resulting from changes in fair value of marketable securities	(8)	(11)	10	4
Other comprehensive income	835	127	630	1,333
Comprehensive loss	(10,198)	(11,347)	(11,141)	(39,613)
Less: Comprehensive loss attributable to noncontrolling interests	(283)	(67)	(490)	(199)
Comprehensive loss attributable to common stockholders	$ (9,915)	$ (11,280)	$ (10,651)	$ (39,414)

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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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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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