Basis of Presentation Basis of Presentation (Details) - USD ($) $ in Thousands	Nov. 30, 2020	Aug. 31, 2020	Nov. 30, 2019	Aug. 31, 2019
Condensed Statement of Income Captions [Line Items]
Foreign currency translation adjustments	$ 74,496	$ 75,896
Pension and other postretirement benefit plans, net of tax	24,545	24,750
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	54	78
Total shareholders’ equity	(367,946)	(359,226)	$ (353,253)	$ (301,179)
AOCI Attributable to Parent [Member]
Condensed Statement of Income Captions [Line Items]
Total shareholders’ equity	$ 99,095	$ 100,724	$ 114,412	$ 171,672