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Consolidated Statements of Operations (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Income Statement [Abstract]        
Loss from discontinued operations, income tax provision $ 0 $ 0 $ 0 $ 0
Loss on disposal of discontinued operations, income tax provision $ 0 $ 0 $ 0 $ 0