Benefit Plans Schedule of Net Benefit Costs (Tables)

6 Months Ended

Feb. 28, 2023

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs of Assumptions Used

Components of net periodic benefit costs for the three and six months ended February 28, 2023 and 2022, are as follows:

	Three Months Ended February 28,
	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	$	9,645	$	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)
	Six Months Ended February 28,
	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	$	19,290	$	23,138	$	920	$	463	$	335	$	498
Interest cost	15,294		8,584		371		141		518		252
Expected return on assets	(21,565)		(21,979)		—		—		—		—
Prior service cost (credit) amortization	75		87		(57)		(57)		(223)		(223)
Actuarial loss (gain) amortization	936		11,703		123		239		(808)		(630)
Net periodic benefit cost (benefit)	$	14,030	$	21,533	$	1,357	$	786	$	(178)	$	(103)