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Industry Segment Information (Schedule Of Revenue By Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues | $ 123,269 | $ 169,571 | $ 130,339 | $ 124,526 | $ 131,937 | $ 151,533 | $ 124,125 | $ 110,390 | $ 547,705 | $ 517,985 | $ 516,411
Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 547,705 | $ 517,985 | $ 516,411
Percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Revenues [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 321,698 | $ 297,261 | $ 321,554
Percentage |  |  |  |  |  |  |  |  | 59.00% | 57.00% | 62.00%
Revenues [Member] | International [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 226,007 | $ 220,724 | $ 194,857
Percentage |  |  |  |  |  |  |  |  | 41.00% | 43.00% | 38.00%
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 | 57,248 |  |  |  | 74,498 |  |  |  | $ 57,248 | $ 74,498 | $ 77,627
Long-Lived Tangible Assets [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 69.00% | 73.00% | 75.00%
Long-lived tangible assets | 39,290 |  |  |  | 54,199 |  |  |  | $ 39,290 | $ 54,199 | $ 58,098
Long-Lived Tangible Assets [Member] | International [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 31.00% | 27.00% | 25.00%
Long-lived tangible assets | $ 17,958 |  |  |  | $ 20,299 |  |  |  | $ 17,958 | $ 20,299 | $ 19,529

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