Retirement Plans (Schedule of Amounts Recognized in Statement of Financial Position) (Details) - USD ($) $ in Thousands	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Other current liabilities	$ 530	$ 530
Other non-current liabilities	5,754	6,374
Net amount recognized	$ 6,284	$ 6,904	$ 6,559

Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant