Benefit Plans Schedule of Net Benefit Costs (Tables)

3 Months Ended

Nov. 30, 2021

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs of Assumptions Used

Components of net periodic benefit costs for the three months ended November 30, 2021 and 2020, are as follows:

	Three Months Ended November 30,
	Qualified Pension Benefits				Nonqualified Pension Benefits				Other Benefits
	2021		2020		2021		2020		2021		2020
Components of net periodic benefit costs:	(Dollars in thousands)
Service cost	$	11,569	$	11,307	$	232	$	108	$	249	$	297
Interest cost	4,292		4,141		70		68		126		123
Expected return on assets	(10,990)		(10,910)		—		—		—		—
Prior service cost (credit) amortization	44		45		(29)		(28)		(111)		(111)
Actuarial loss (gain) amortization	5,852		5,447		120		53		(315)		(341)
Net periodic benefit cost (benefit)	$	10,767	$	10,030	$	393	$	201	$	(51)	$	(32)