Income Taxes (Schedule Of Effective income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2017	Aug. 31, 2018	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Income Tax Disclosure [Abstract]
U.S. statutory rate			$ 8,700	$ 12,500	$ 10,251
State and local taxes, net of federal tax benefit			743	480	350
Foreign tax rate differences			809	(486)	(195)
U.S. tax reform			2,496
Deferred tax asset valuation allowance			758	(21)	(124)
Domestic production activities deduction			(727)	(700)	(960)
Other			797	763	(301)
Total income tax provision			$ 13,576	$ 12,536	$ 9,021
U.S statutory rate, percentage	35.00%	21.00%	25.70%	35.00%	35.00%
State and local taxes, net of federal tax benefit, percentage			2.20%	1.30%	1.20%
Foreign tax rate differences, percentage			2.40%	(1.40%)	(0.70%)
U.S. tax reform, percentage			7.40%
Deferred tax asset valuation allowance, percentage			2.20%		(0.40%)
Domestic production activities deduction, percentage			(2.10%)	(2.00%)	(3.30%)
Other, percentage			2.30%	2.20%	(1.00%)
Effective rate, percentage			40.10%	35.10%	30.80%