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Investments in Unconsolidated Entities - Summarized Balance Sheet Financial Information of Investments in Unconsolidated Affiliates (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Apr. 30, 2013
Investment Holdings [Abstract]
Current assets	$ 17,854	$ 16,644
Noncurrent assets	26,956	28,139
Current liabilities	16,398	19,247
Noncurrent liabilities	$ 2,097	$ 1,227

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