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Summary of Significant Accounting Policies - Summarized Income Statement Financial Information of Investments in Unconsolidated Affiliates (Detail) (GreenFiber [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
GreenFiber [Member]
Schedule of Equity Method Investments [Line Items]
Revenue	$ 67,062	$ 77,544	$ 84,903
Gross profit	12,502	10,521	14,025
Net loss	$ (8,810)	$ (20,003)	$ (8,192)

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