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Benefit Plans
 6 Months Ended
Feb. 28, 2021
Retirement Benefits [Abstract]  
Benefit plans Benefit Plans    We have various pension and other defined benefit and defined contribution plans, in which substantially all employees may participate. We also have nonqualified supplemental executive and Board retirement plans.
    Components of net periodic benefit costs for the three and six months ended February 28, 2021, and February 29, 2020, are as follows:
Three Months Ended
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 February 28, 2021February 29, 2020February 28, 2021February 29, 2020February 28, 2021February 29, 2020
Components of net periodic benefit costs:
 (Dollars in thousands)
Service cost$11,307 $10,538 $108 $101 $297 $262 
Interest cost4,141 5,431 68 107 123 187 
Expected return on assets(10,910)(11,671)— — — — 
Prior service cost (credit) amortization45 45 (28)(28)(111)(111)
Actuarial loss (gain) amortization5,447 5,396 53 25 (341)(348)
Net periodic benefit cost (benefit)$10,030 $9,739 $201 $205 $(32)$(10)
Six Months Ended
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 February 28, 2021February 29, 2020February 28, 2021February 29, 2020February 28, 2021February 29, 2020
Components of net periodic benefit costs:
 (Dollars in thousands)
Service cost$22,614 $21,076 $217 $203 $593 $525 
Interest cost8,281 10,861 136 214 246 374 
Expected return on assets(21,821)(23,342)— — — — 
Prior service cost (credit) amortization89 89 (57)(57)(223)(223)
Actuarial loss (gain) amortization10,895 10,791 106 49 (682)(696)
Net periodic benefit cost (benefit)$20,058 $19,475 $402 $409 $(66)$(20)

    The service cost component of defined benefit net periodic benefit cost is recorded in cost of goods sold and marketing, general and administrative expenses. The other components of net periodic benefit cost are recorded in other income.

Employer Contributions

    Any contributions made during fiscal 2021 will depend primarily on market returns on the pension plan assets and minimum funding level requirements. No contributions were made to the pension plans during the six months ended February 28, 2021, and we do not currently anticipate being required to make contributions for our pension plans in fiscal 2021.