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Segments and Other Geographic Information (Details 1) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Segment Reporting Information, Profit (Loss) [Abstract]      
Long-lived assets $ 712,743 $ 606,070 $ 621,775
Other
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Long-lived assets 44,219      
International Total
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Long-lived assets 151,179 95,704 100,217
Operating segments | North America
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Long-lived assets 565,590 514,527 526,137
Operating segments | United Kingdom
     
Segment Reporting Information, Profit (Loss) [Abstract]      
Long-lived assets $ 102,934 $ 91,543 $ 95,638