Benefit Plans Schedule of Net Benefit Costs (Tables)

3 Months Ended

Nov. 30, 2022

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs of Assumptions Used

Components of net periodic benefit costs for the three months ended November 30, 2022 and 2021, are as follows:

	Three Months Ended November 30,
	Qualified Pension Benefits				Nonqualified Pension Benefits				Other Benefits
	2022		2021		2022		2021		2022		2021
Components of net periodic benefit costs:	(Dollars in thousands)
Service cost	$	9,645	$	11,569	$	460	$	232	$	168	$	249
Interest cost	7,647		4,292		185		70		259		126
Expected return on assets	(10,782)		(10,990)		—		—		—		—
Prior service cost (credit) amortization	37		44		(29)		(29)		(111)		(111)
Actuarial loss (gain) amortization	468		5,852		61		120		(404)		(315)
Net periodic benefit cost (benefit)	$	7,015	$	10,767	$	677	$	393	$	(88)	$	(51)