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Discontinued Operations - Condensed Results Of Operations For Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenues $ 32 $ 983
Royalties earned from sale of business 161 0
Income from discontinued operations $ 140 $ 240