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Summarized Results from Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenues from discontinued operations $ 4,390 $ 2,535 $ 8,642
Income from discontinued operations before income taxes 673 303 1,119
Income tax expense 253 23 421
Net income from discontinued operations 420 280 698
Loss on disposal of discontinued operations, net of tax   (1,537)  
Net income (loss) from discontinued operations, net of tax $ 420 $ (1,257) $ 698