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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
Jul. 31, 2013
Jul. 31, 2012
Investment Holdings [Abstract]    
Revenue $ 14,731 $ 13,101
Gross profit 2,685 1,599
Net loss $ (1,995) $ (3,569)