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Summary of Significant Accounting Policies - Summarized Balance Sheet Financial Information of Investments in Unconsolidated Affiliates (Detail) (GreenFiber [Member], USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Apr. 30, 2012
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GreenFiber [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Current assets | $ 16,644 | $ 17,513
Noncurrent assets | 28,139 | 34,597
Current liabilities | 19,247 | 12,815
Noncurrent liabilities | $ 1,227 | $ 5,382

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