Retirement Plans (Narrative) (Details) $ in Thousands	12 Months Ended
	Aug. 31, 2022 USD ($) Executive CompensationYears	Aug. 31, 2021 USD ($)	Aug. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 1,200	$ 1,300	$ 1,200
Number of former executives | Executive	5
Number of highest compensation years | CompensationYears	3
Discount rate, liability	4.10%	2.60%
Discount Rate, net periodic benefit cost	2.60%	2.20%	3.30%
Actuarial loss	$ (488)	$ (236)
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	$ 200