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Benefit Plans | 9 Months Ended
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May 31, 2018
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 non-qualified supplemental executive and Board retirement plans. Components of net periodic benefit costs for the three and nine months ended May 31, 2018, and 2017, are as follows:
| Qualified Pension Benefits |  | Non-Qualified Pension Benefits |  | Other Benefits
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Components of net periodic benefit costs for the three months ended May 31 are as follows: | (Dollars in thousands)
Service cost | $ | 9,920 |  |  | $ | 10,537 |  |  | $ | 137 |  |  | $ | 302 |  |  | $ | 236 |  |  | $ | 290 |
Interest cost | 5,997 |  |  | 5,753 |  |  | 177 |  |  | 210 |  |  | 227 |  |  | 232 |
Expected return on assets | (12,044 | ) |  | (12,058 | ) |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 360 |  |  | 385 |  |  | 7 |  |  | 4 |  |  | (142 | ) |  | (141 | )
Actuarial (gain) loss amortization | 4,905 |  |  | 5,708 |  |  | 16 |  |  | 136 |  |  | (306 | ) |  | (199 | )
Net periodic benefit cost | $ | 9,138 |  |  | $ | 10,325 |  |  | $ | 337 |  |  | $ | 652 |  |  | $ | 15 |  |  | $ | 182 |
Components of net periodic benefit costs for the nine months ended May 31 are as follows: |
Service cost | $ | 29,758 |  |  | $ | 31,612 |  |  | $ | 411 |  |  | $ | 905 |  |  | $ | 707 |  |  | $ | 870 |
Interest cost | 17,988 |  |  | 17,257 |  |  | 533 |  |  | 632 |  |  | 681 |  |  | 698 |
Expected return on assets | (36,133 | ) |  | (36,173 | ) |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 1,078 |  |  | 1,155 |  |  | 23 |  |  | 14 |  |  | (424 | ) |  | (424 | )
Actuarial (gain) loss amortization | 16,304 |  |  | 17,123 |  |  | 46 |  |  | 409 |  |  | (918 | ) |  | (598 | )
Net periodic benefit cost | $ | 28,995 |  |  | $ | 30,974 |  |  | $ | 1,013 |  |  | $ | 1,960 |  |  | $ | 46 |  |  | $ | 546 |
Employer Contributions Total contributions to be made during fiscal 2018 will depend primarily on market returns on the pension plan assets and minimum funding level requirements. During the nine months ended May 31, 2018, we made no contributions to the pension plans. At this time, we do not anticipate being required to make a contribution for our benefit plans in fiscal 2018.

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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