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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, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues | $ 101,885 | $ 121,054 | $ 109,182 | $ 111,951 | $ 123,269 | $ 169,571 | $ 130,339 | $ 124,526 | $ 444,072 | $ 547,705 | $ 517,985
Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 444,072 | $ 547,705 | $ 517,985
Percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Revenues [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 257,719 | $ 321,698 | $ 297,261
Percentage |  |  |  |  |  |  |  |  | 58.00% | 59.00% | 57.00%
Revenues [Member] | International [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 186,353 | $ 226,007 | $ 220,724
Percentage |  |  |  |  |  |  |  |  | 42.00% | 41.00% | 43.00%
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 | 68,968 |  |  |  | 57,248 |  |  |  | $ 68,968 | $ 57,248 | $ 74,498
Long-Lived Tangible Assets [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 76.00% | 69.00% | 73.00%
Long-lived tangible assets | 52,187 |  |  |  | 39,290 |  |  |  | $ 52,187 | $ 39,290 | $ 54,199
Long-Lived Tangible Assets [Member] | International [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 24.00% | 31.00% | 27.00%
Long-lived tangible assets | $ 16,781 |  |  |  | $ 17,958 |  |  |  | $ 16,781 | $ 17,958 | $ 20,299

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