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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2019 | May 31, 2018 | May 31, 2019 | May 31, 2018 | Aug. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax (benefit) expense | $ 332 | $ 7,066 | $ (827) | $ 12,614 |
Estimated annual effective income tax rate |  |  | 42.60% | 28.50% |
Blended U.S. corporate income tax rate |  |  | 21.00% | 25.70% |
Tax adjustment for unusual items |  |  | $ 800 | $ 4,700 |
Deemed repatriation tax expense |  |  |  |  | $ 1,700

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