Retirement Plans (Narrative) (Details) $ in Thousands	12 Months Ended
	Aug. 31, 2022 USD ($)	Aug. 31, 2021 USD ($) item	Aug. 31, 2020 USD ($)	Aug. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ 1,300	$ 1,200	$ 1,200
Number of former executives | item		5
Number of highest compensation years | item		3
Discount rate, liability		2.60%	2.20%
Discount Rate, net periodic benefit cost		2.20%	3.30%	4.00%
Actuarial loss		$ (236)	$ 667
Scenario, Forecast [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	$ 300