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Benefit Plans - Components of Net Periodic Benefit Costa and Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2023
Pension Benefits | Qualified Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost	$ (6,236)	$ 223	$ 490
Net actuarial loss (gain)	22,472	23,309	14,082
Amortization of actuarial (gain) loss	(12,815)	(1,796)	(1,872)
Amortization of prior service (credit) costs	(199)	(178)	(149)
Total recognized in other comprehensive loss (income)	3,222	21,558	12,551
Pension Benefits | Nonqualified Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost	(227)	0	0
Net actuarial loss (gain)	2,896	4,087	1,282
Amortization of actuarial (gain) loss	(799)	(380)	(245)
Amortization of prior service (credit) costs	47	114	114
Total recognized in other comprehensive loss (income)	1,917	3,821	1,151
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost	0	0	0
Net actuarial loss (gain)	(1,519)	2,145	(1,865)
Amortization of actuarial (gain) loss	1,192	1,616	1,615
Amortization of prior service (credit) costs	445	445	445
Total recognized in other comprehensive loss (income)	$ 118	$ 4,206	$ 195

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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