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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, 2014 | May 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2014 | Aug. 31, 2013 | Aug. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues | $ 147,522 | $ 169,936 | $ 152,804 | $ 147,671 | $ 148,397 | $ 219,542 | $ 175,539 | $ 147,370 | $ 617,933 | $ 690,848 | $ 551,255
Total Long-Lived Assets | 72,457 |  |  |  | 65,064 |  |  |  | 72,457 | 65,064 | 56,180
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 377,652 | 428,929 | 354,649
Total Long-Lived Assets | 55,378 |  |  |  | 53,894 |  |  |  | 55,378 | 53,894 | 45,100
International [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 240,281 | 261,919 | 196,606
Total Long-Lived Assets | $ 17,079 |  |  |  | $ 11,170 |  |  |  | $ 17,079 | $ 11,170 | $ 11,080
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 |  |  |  |  |  |  |  |  | 61.00% | 62.00% | 64.00%
Revenues [Member] | International [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 39.00% | 38.00% | 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 |  |  |  |  |  |  |  |  | 76.00% | 83.00% | 80.00%
Long-Lived Tangible Assets [Member] | International [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 24.00% | 17.00% | 20.00%

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