Employee Benefits - Defined Benefit Pension Plan and Supplemental Executive Retirement Benefit Plan - Additional Information (Details) - USD ($)	12 Months Ended
	Aug. 31, 2023	Aug. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, funded (unfunded) status of plan	$ 4,000,000	$ 4,000,000
Defined benefit plan, amortization of gain (loss), percent threshold	5.00%
Defined benefit plan, fair value of plan assets	$ 15,000,000	16,000,000
Defined benefit plan, benefit obligation	11,000,000	$ 12,000,000
Defined benefit plan, expected future employer contributions, next fiscal year	$ 0
Defined benefit plan, assumptions used calculating benefit obligation, discount rate	5.13%	4.40%
Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, annual expected future benefit payments	$ 1,000,000
Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, annual expected future benefit payments	4,000,000
Supplemental Employee Retirement Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Assets for plan benefits, defined benefit plan	4,000,000	$ 4,000,000
Defined benefit plan, benefit obligation	$ 4,000,000	$ 4,000,000