Benefit Plans
 9 Months Ended
May 31, 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 nine months ended May 31, 2021 and 2020, are as follows:
Three Months Ended May 31,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202120202021202020212020
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)
Nine Months Ended May 31,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202120202021202020212020
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$33,921 $31,613 $325 $304 $890 $787 
Interest cost12,422 16,292 205 322 369 560 
Expected return on assets(32,731)(35,013)— — — — 
Prior service cost (credit) amortization134 134 (85)(85)(334)(334)
Actuarial loss (gain) amortization16,342 16,187 159 74 (1,024)(1,044)
Net periodic benefit cost (benefit)$30,088 $29,213 $604 $615 $(99)$(31)

    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 nine months ended May 31, 2021, and we do not currently anticipate being required to make contributions for our pension plans in fiscal 2021.