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Benefit Plans - Schedule of Amortization from Other Accumulated Comprehensive Income into Net Period Benefit Costs (Details)
$ in Thousands
Aug. 31, 2021
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, health care benefits annual rate of increase in the per capita cost 6.80%
Defined benefit plan, health care benefits, decrease in the per capita cost trend rate 4.50%
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Fiscal 2018 Amortization of prior service cost (credit) $ 178
Fiscal 2018 Amortization of net actuarial (gain) loss 23,343
Non-Qualified Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Fiscal 2018 Amortization of prior service cost (credit) (114)
Fiscal 2018 Amortization of net actuarial (gain) loss 478
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Fiscal 2018 Amortization of prior service cost (credit) (445)
Fiscal 2018 Amortization of net actuarial (gain) loss $ (1,259)