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Discontinued Operations Operating Results, Details (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operations, Loss (Gain) on Write-down $ 15,658 $ 0 $ 15,658 $ 0