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

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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