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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	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