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Industry Segment Information (Schedule Of Revenue By Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2013 | Aug. 31, 2012 | Aug. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues | $ 148,397 | $ 219,542 | $ 175,539 | $ 147,370 | $ 127,817 | $ 172,099 | $ 132,134 | $ 119,205 | $ 690,848 | $ 551,255 | $ 478,890
Total Long-Lived Assets | 65,064 |  |  |  | 56,180 |  |  |  | 65,064 | 56,180 | 58,465
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 428,929 | 354,649 | 307,694
Total Long-Lived Assets | 53,894 |  |  |  | 45,100 |  |  |  | 53,894 | 45,100 | 45,091
International [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 261,919 | 196,606 | 171,196
Total Long-Lived Assets | $ 11,170 |  |  |  | $ 11,080 |  |  |  | $ 11,170 | $ 11,080 | $ 13,374
Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Revenues [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 62.00% | 64.00% | 64.00%
Revenues [Member] | International [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 38.00% | 36.00% | 36.00%
Long-Lived Tangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Long-Lived Tangible Assets [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 83.00% | 80.00% | 77.00%
Long-Lived Tangible Assets [Member] | International [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 17.00% | 20.00% | 23.00%

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