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Segment Reporting (Segment Reporting Information) (Details) (USD $)
In Thousands
3 Months Ended12 Months Ended
Aug. 31, 2011
May 31, 2011
Feb. 28, 2011
Nov. 30, 2010
Aug. 31, 2010
May 31, 2010
Feb. 28, 2010
Nov. 30, 2009
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2009
Segment Reporting Information [Line Items]           
Revenues from clients$ 191,939$ 183,647$ 177,635$ 173,289$ 168,234$ 160,301$ 157,281$ 155,243$ 726,510[1]$ 641,059[1]$ 622,023[1]
Segment operating profit58,99061,82358,09359,42957,43055,68454,47354,047238,335221,634211,030
Total assets657,440   644,608   657,440644,608633,952
Depreciation and amortization        36,84737,34334,337
Stock-based compensation        25,77314,06513,623
Capital expenditures        29,34320,76824,040
U.S. [Member]
           
Segment Reporting Information [Line Items]           
Revenues from clients        497,564[1]435,351[1]423,926[1]
Segment operating profit        135,327124,976126,190
Total assets353,205   401,684   353,205401,684410,420
Depreciation and amortization        27,46328,86626,992
Stock-based compensation        23,09112,47112,067
Capital expenditures        20,58813,89019,144
Europe [Member]
           
Segment Reporting Information [Line Items]           
Revenues from clients        178,693161,649156,610
Segment operating profit        79,63772,23960,132
Total assets274,139   216,171   274,139216,171203,551
Depreciation and amortization        6,0926,4666,750
Stock-based compensation        2,3641,4241,394
Capital expenditures        2,7706842,772
Asia Pacific [Member]
           
Segment Reporting Information [Line Items]           
Revenues from clients        50,253[1]44,059[1]41,487[1]
Segment operating profit        23,37124,41924,708
Total assets30,096   26,753   30,09626,75319,981
Depreciation and amortization        3,2922,011595
Stock-based compensation        318170162
Capital expenditures        $ 5,985$ 6,194$ 2,124
[1]Revenues are attributed to countries based on the location of the client.