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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 | Nov. 30, 2017 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017 | Dec. 31, 2018 | Aug. 31, 2018 | Dec. 31, 2017
Income Tax [Line Items] |  |  |  |  |  |  |  |
Provision for income taxes | 18.70% |  | 32.80% | 21.10% | 30.70% |  |  |
Unrecognized tax benefits affected by the resolution of tax examinations or expiring statutes of limitation | $ 200 |  |  | $ 200 |  |  |  |
Federal income tax rate |  |  |  |  |  |  |  | 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 |  |  |  |
Other income taxes payable | 6,800 |  |  | 6,800 |  |  |  |
Excess tax benefits | 3,398 |  | $ 6,046 | $ 7,324 | $ 10,684 |  |  |
Toll tax repayment period |  |  |  | 8 years |  |  |  |
Scenario, Plan [Member] |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Federal income tax rate |  |  |  |  |  | 21.00% |  |
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 | $ 200 | $ 600 |  | $ 800 |  |  |  |
Accounting Standards Update 2016-09 [Member] | Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Excess tax benefits |  | $ 800 |  | $ 800 |  |  |  |

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