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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, 2021	Aug. 31, 2020	Aug. 31, 2019
Pension Benefits | Qualified Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost	$ 113	$ 0	$ 18
Net actuarial loss (gain)	(4,408)	3,401	47,556
Amortization of actuarial (gain) loss	(21,790)	(21,583)	(12,307)
Amortization of prior service (credit) costs	(178)	(178)	(190)
Settlement of retiree obligations	0	0	0
Total recognized in other comprehensive loss (income)	(26,263)	(18,360)	35,077
Pension Benefits | Nonqualified Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost	0	0	0
Net actuarial loss (gain)	1,978	2,157	1,917
Amortization of actuarial (gain) loss	(212)	(98)	(2)
Amortization of prior service (credit) costs	114	114	75
Settlement of retiree obligations	0	(397)	(191)
Total recognized in other comprehensive loss (income)	1,880	1,776	1,799
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)	(1,163)	(1,011)	801
Amortization of actuarial (gain) loss	1,365	1,392	1,627
Amortization of prior service (credit) costs	445	445	556
Settlement of retiree obligations	0	0	0
Total recognized in other comprehensive loss (income)	$ 647	$ 826	$ 2,984

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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 reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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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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