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Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified | Jul. 31, 2012 | Jul. 31, 2011
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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)

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