Retirement Plans (Schedule Of Amounts Recognized In The Statement Of Financial Position) (Details) - USD ($) $ in Thousands	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Retirement Plans [Abstract]
Other current liabilities	$ 530	$ 557
Pension benefit liabilities	6,295	6,869
Net amount recognized	$ 6,825	$ 7,426	$ 7,126