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Income Taxes (Details 4) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2012
Jul. 31, 2011
Schedule Of Deferred Tax Assets (Liabilities) [Line Items]    
Net deferred tax asset (liability) $ (18,694) $ 1,072
North America
    
Schedule Of Deferred Tax Assets (Liabilities) [Line Items]    
North America current liabilities 3,601 (440)
North America non-current assets 22,279 9,425
United Kingdom
    
Schedule Of Deferred Tax Assets (Liabilities) [Line Items]    
U.K. non-current liabilities $ (7,186) $ (10,057)