Benefit Plans Schedule of Net Benefit Costs (Tables)

3 Months Ended

Nov. 30, 2023

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs of Assumptions Used

Components of net periodic benefit costs for the three months ended November 30, 2023 and 2022, are as follows:

	Three Months Ended November 30,
	Qualified Pension Benefits				Nonqualified Pension Benefits				Other Benefits
	2023		2022		2023		2022		2023		2022
Components of net periodic benefit costs:	(Dollars in thousands)
Service cost	$	9,348	$	9,645	$	492	$	460	$	163	$	168
Interest cost	8,982		7,647		261		185		286		259
Expected return on assets	(11,965)		(10,782)		—		—		—		—
Prior service cost (credit) amortization	45		37		(29)		(29)		(111)		(111)
Actuarial loss (gain) amortization	449		468		95		61		(404)		(404)
Net periodic benefit cost (benefit)	$	6,859	$	7,015	$	819	$	677	$	(66)	$	(88)