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Investments In Unconsolidated Entities (Summarized Income Statement Financial Information of Investments in Unconsolidated Affiliates) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Schedule of Equity Method Investments [Line Items]
Revenue	$ 17,608	$ 23,460	$ 50,203	$ 61,317
Gross profit	3,638	(5,597)	9,538	(2,082)
Net loss	$ (2,785)	$ (12,818)	$ (6,651)	$ (20,382)

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