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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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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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

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