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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	Jul. 31, 2013	Apr. 30, 2013
Investment Holdings [Abstract]
Current assets	$ 13,877	$ 16,644
Noncurrent assets	27,567	28,139
Current liabilities	13,105	19,247
Noncurrent liabilities	$ 1,978	$ 1,227

The amount of current assets reported by an equity method investment of the entity.

The amount of current liabilities reported by an equity method investment of the entity.

The amount of noncurrent assets reported by an equity method investment of the entity.

The amount of noncurrent liabilities reported by an equity method investment of the entity.