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Segment Reporting (Details 2) (USD $)
In Thousands
3 Months Ended12 Months Ended
Aug. 31, 2011
May 31, 2011
Feb. 28, 2011
Nov. 30, 2010
Aug. 31, 2010
May 31, 2010
Feb. 28, 2010
Nov. 30, 2009
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2009
Net revenue$ 1,122,121$ 1,235,837$ 1,048,629$ 1,326,435$ 1,259,420$ 1,337,404$ 1,070,336$ 1,258,659$ 4,733,022$ 4,925,819$ 3,953,566
Long-lived assets807,441   1,092,289   807,4411,092,2891,283,536
United States [Member]
           
Net revenue        4,437,0794,617,5333,879,615
Long-lived assets471,703   547,715   471,703547,715496,493
United Kingdom [Member]
           
Net revenue        222,732228,17713,062
Long-lived assets214,073   430,475   214,073430,475698,273
Latin America [Member]
           
Net revenue        50,72553,76554,536
Long-lived assets86,103   81,870   86,10381,87086,137
Other Geographical Areas [Member]
           
Net revenue        22,48626,3446,353
Long-lived assets$ 35,562   $ 32,229   $ 35,562$ 32,229$ 2,633