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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended | 16 Months Ended
--- | --- | --- | --- | --- | ---
May 31, 2018 | Feb. 28, 2018 | May 31, 2017 | May 31, 2018 | May 31, 2018 | May 31, 2017 | Aug. 31, 2018 | Dec. 31, 2017
Income Tax [Line Items] |  |  |  |  |  |  |  |
Provision for income taxes | 24.30% |  | 28.80% |  | 22.30% | 30.00% |  |
Unrecognized tax benefits affected by the resolution of tax examinations or expiring statutes of limitation | $ 200 |  |  | $ 200 | $ 200 |  |  |
Federal income tax rate |  |  |  | 21.00% |  |  |  | 35.00%
Reduction of deferred income tax liability |  | $ 6,900 |  |  |  |  |  |
Impact on provision for income taxes |  |  |  |  | 6,800 |  |  |
Other long-term liabilities | 6,300 |  |  | $ 6,300 | 6,300 |  |  |
Other income taxes payable | 6,800 |  |  | $ 6,800 | 6,800 |  |  |
Excess tax benefits | $ 5,167 |  | $ 5,842 |  | $ 12,491 | $ 16,526 |  |
Toll tax repayment period |  |  |  |  | 8 years |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Federal income tax rate |  |  |  |  |  |  | 25.70% |
Percentage between blended rate and prior fiscal year |  |  |  |  |  |  | 9.00% |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Excess tax benefits |  |  |  |  | $ 800 |  |  |

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