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Calculation of Estimated Loss on Disposal of Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Estimated cash proceeds $ 30,500
Basis in net assets sold as of April 30, 2014 39,316
Estimated costs incurred directly attributable to the transaction 658
Estimated loss before income taxes (9,474)
Estimated income tax benefit (282)
Estimated loss on disposal of discontinued operations, net of taxes $ (9,192)