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Benefit Plans (Tables) | 12 Months Ended
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Aug. 31, 2018
Retirement Benefits [Abstract] |
Schedule of defined benefit plans disclosures | Financial information on changes in benefit obligation, plan assets funded and balance sheet status as of August 31, 2018, and 2017, is as follows:
| Qualified Pension Benefits |  | Non-Qualified Pension Benefits |  | Other Benefits
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
| (Dollars in thousands)
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of period | $ | 806,174 |  |  | $ | 812,749 |  |  | $ | 25,599 |  |  | $ | 32,696 |  |  | $ | 31,836 |  |  | $ | 36,779 |
Service cost | 39,677 |  |  | 42,149 |  |  | 548 |  |  | 1,206 |  |  | 943 |  |  | 1,160 |
Interest cost | 24,007 |  |  | 22,999 |  |  | 711 |  |  | 843 |  |  | 908 |  |  | 930 |
Actuarial (gain) loss | 3,146 |  |  | (10,054 | ) |  | 205 |  |  | (5,692 | ) |  | (623 | ) |  | (4,650 | )
Assumption change | (36,515 | ) |  | (17,750 | ) |  | (783 | ) |  | (655 | ) |  | (1,612 | ) |  | (775 | )
Plan amendments | 244 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlements | — |  |  | — |  |  | (4,824 | ) |  | (2,131 | ) |  | — |  |  | — |
Benefits paid | (69,549 | ) |  | (43,919 | ) |  | (701 | ) |  | (668 | ) |  | (1,662 | ) |  | (1,608 | )
Benefit obligation at end of period | $ | 767,184 |  |  | $ | 806,174 |  |  | $ | 20,755 |  |  | $ | 25,599 |  |  | $ | 29,790 |  |  | $ | 31,836 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of period | $ | 875,820 |  |  | $ | 883,265 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Actual gain (loss) on plan assets | 23,345 |  |  | 36,474 |  |  | — |  |  | — |  |  | — |  |  | — |
Company contributions | — |  |  | — |  |  | 5,525 |  |  | 2,799 |  |  | 1,662 |  |  | 1,608 |
Settlements | — |  |  | — |  |  | (4,824 | ) |  | (2,131 | ) |  | — |  |  | — |
Benefits paid | (69,549 | ) |  | (43,919 | ) |  | (701 | ) |  | (668 | ) |  | (1,662 | ) |  | (1,608 | )
Fair value of plan assets at end of period | $ | 829,616 |  |  | $ | 875,820 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Funded status at end of period | $ | 62,432 |  |  | $ | 69,646 |  |  | $ | (20,755 | ) |  | $ | (25,599 | ) |  | $ | (29,790 | ) |  | $ | (31,836 | )
Amounts recognized on balance sheet: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-current assets | $ | 62,432 |  |  | $ | 70,019 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Accrued benefit cost: |  |  |  |  |  |  |  |  |  |  |
Current liabilities | — |  |  | — |  |  | (1,780 | ) |  | (2,270 | ) |  | (2,040 | ) |  | (2,140 | )
Non-current liabilities | — |  |  | (373 | ) |  | (18,975 | ) |  | (23,329 | ) |  | (27,750 | ) |  | (29,696 | )
Ending balance | $ | 62,432 |  |  | $ | 69,646 |  |  | $ | (20,755 | ) |  | $ | (25,599 | ) |  | $ | (29,790 | ) |  | $ | (31,836 | )
Amounts recognized in accumulated other comprehensive loss (pretax): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) | $ | 1,288 |  |  | $ | 2,481 |  |  | $ | (691 | ) |  | $ | (660 | ) |  | $ | (3,716 | ) |  | $ | (4,281 | )
Net (gain) loss | 209,606 |  |  | 236,232 |  |  | 427 |  |  | 953 |  |  | (17,875 | ) |  | (16,864 | )
Ending balance | $ | 210,894 |  |  | $ | 238,713 |  |  | $ | (264 | ) |  | $ | 293 |  |  | $ | (21,591 | ) |  | $ | (21,145 | )
Schedule of information for pensions plans with an accumulated benefit obligation in excess of plan assets | Information for the pension plans with an accumulated benefit obligation in excess of plan assets is set forth below:
| For the Years Ended August 31,
| 2018 |  | 2017
| (Dollars in thousands)
Projected benefit obligation | $ | 20,755 |  |  | $ | 28,177 |
Accumulated benefit obligation | 18,586 |  |  | 23,221 |
Fair value of plan assets | — |  |  | 2,203 |
Schedule of net benefit costs of assumptions used | Components of net periodic benefit costs for the years ended August 31, 2018, 2017, and 2016 are as follows:
| Qualified Pension Benefits |  | Non-Qualified Pension Benefits |  | Other Benefits
| 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
| (Dollars in thousands)
Components of net periodic benefit costs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 39,677 |  |  | $ | 42,149 |  |  | $ | 37,533 |  |  | $ | 548 |  |  | $ | 1,206 |  |  | $ | 1,035 |  |  | $ | 943 |  |  | $ | 1,160 |  |  | $ | 1,412 |
Interest cost | 24,007 |  |  | 22,999 |  |  | 30,773 |  |  | 711 |  |  | 843 |  |  | 1,406 |  |  | 908 |  |  | 930 |  |  | 1,709 |
Expected return on assets | (48,159 | ) |  | (48,235 | ) |  | (48,055 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlement of retiree obligations | — |  |  | — |  |  | — |  |  | (112 | ) |  | (30 | ) |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 1,437 |  |  | 1,540 |  |  | 1,606 |  |  | 30 |  |  | 19 |  |  | 228 |  |  | (565 | ) |  | (565 | ) |  | (120 | )
Actuarial loss (gain) amortization | 18,073 |  |  | 22,869 |  |  | 19,016 |  |  | 61 |  |  | 546 |  |  | 692 |  |  | (1,224 | ) |  | (798 | ) |  | (464 | )
Net periodic benefit cost | $ | 35,035 |  |  | $ | 41,322 |  |  | $ | 40,873 |  |  | $ | 1,238 |  |  | $ | 2,584 |  |  | $ | 3,361 |  |  | $ | 62 |  |  | $ | 727 |  |  | $ | 2,537 |
Weighted-average assumptions to determine the net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 3.80 | % |  | 3.60 | % |  | 4.20 | % |  | 3.53 | % |  | 3.28 | % |  | 4.20 | % |  | 3.56 | % |  | 3.30 | % |  | 4.20 | %
Expected return on plan assets | 5.75 | % |  | 5.75 | % |  | 6.00 | % |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Rate of compensation increase | 5.08 | % |  | 5.60 | % |  | 4.90 | % |  | 5.08 | % |  | 5.60 | % |  | 4.90 | % |  | N/A |  |  | N/A |  |  | N/A |
Weighted-average assumptions to determine the benefit obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 4.23 | % |  | 3.80 | % |  | 3.60 | % |  | 4.09 | % |  | 3.53 | % |  | 3.28 | % |  | 4.13 | % |  | 3.56 | % |  | 3.30 | %
Rate of compensation increase | 5.14 | % |  | 5.08 | % |  | 5.60 | % |  | 5.14 | % |  | 5.08 | % |  | 5.60 | % |  | N/A |  |  | N/A |  |  | N/A |
Schedule of components of net periodic benefit costs and amounts recognized in other comprehensive income (loss) | Components of net periodic benefit costs and amounts recognized in other comprehensive income (loss) for the years ended August 31, 2018, 2017, and 2016 are as follows:
| Qualified Pension Benefits |  | Non-Qualified Pension Benefits |  | Other Benefits
| 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
| (Dollars in thousands)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) | $ | 244 |  |  | $ | — |  |  | $ | 411 |  |  | $ | — |  |  | $ | — |  |  | $ | (1,044 | ) |  | $ | — |  |  | $ | — |  |  | $ | (4,495 | )
Net actuarial loss (gain) | (8,553 | ) |  | (16,044 | ) |  | 17,712 |  |  | (578 | ) |  | (6,345 | ) |  | (655 | ) |  | (2,234 | ) |  | (5,427 | ) |  | (2,290 | )
Amortization of actuarial loss (gain) | (18,073 | ) |  | (22,869 | ) |  | (19,016 | ) |  | (61 | ) |  | (546 | ) |  | (692 | ) |  | 1,224 |  |  | 798 |  |  | 464 |
Amortization of prior service costs (credit) | (1,437 | ) |  | (1,540 | ) |  | (1,606 | ) |  | (30 | ) |  | (19 | ) |  | (228 | ) |  | 565 |  |  | 565 |  |  | 120 |
Settlement of retiree obligations (a) | — |  |  | — |  |  | — |  |  | 112 |  |  | 30 |  |  | — |  |  | — |  |  | — |  |  | — |
Total recognized in other comprehensive income | $ | (27,819 | ) |  | $ | (40,453 | ) |  | $ | (2,499 | ) |  | $ | (557 | ) |  | $ | (6,880 | ) |  | $ | (2,619 | ) |  | $ | (445 | ) |  | $ | (4,064 | ) |  | $ | (6,201 | )
(a) Reflects amounts reclassified from accumulated other comprehensive income (loss) to net earnings
Schedule of amounts in accumulated other comprehensive income (loss) to be recognized over next fiscal year | The estimated amortization in fiscal 2019 from accumulated other comprehensive loss into net periodic benefit cost is as follows:
| Qualified Pension Benefits |  | Non-Qualified Pension Benefits |  | Other Benefits
| (Dollars in thousands)
Amortization of prior service cost (credit) | $ | 190 |  |  | $ | (75 | ) |  | $ | (556 | )
Amortization of net actuarial (gain) loss | 12,266 |  |  | 2 |  |  | (1,629 | )
Schedule of effect of one-percentage-point change in assumed health care cost trend rates | A one-percentage point change in the assumed health care cost trend rates would have the following effects:
| 1% Increase |  | 1% Decrease
| (Dollars in thousands)
Effect on total of service and interest cost components | $ | 230 |  |  | $ | (200 | )
Effect on postretirement benefit obligation | 2,400 |  |  | (2,100 | )
Schedule of expected benefit payments | Our retiree benefit payments, which reflect expected future service, are anticipated to be paid as follows:
| Qualified Pension Benefits |  | Non-Qualified Pension Benefits |  | Other Benefits Gross
| (Dollars in thousands)
2019 | $ | 66,528 |  |  | $ | 1,780 |  |  | $ | 2,040 |
2020 | 62,320 |  |  | 1,670 |  |  | 2,260 |
2021 | 61,279 |  |  | 1,750 |  |  | 2,400 |
2022 | 62,877 |  |  | 2,230 |  |  | 2,590 |
2023 | 64,573 |  |  | 1,840 |  |  | 2,720 |
2024-2028 | 328,313 |  |  | 9,270 |  |  | 12,690 |
Schedule of defined benefit plans, fair value disclosure | Our pension plans’ recurring fair value measurements by asset category at August 31, 2018, and 2017, are presented in the tables below:
| 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in thousands)
Cash and cash equivalents | $ | 7,424 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,424 |
Equities: |  |  |  |  |  |  |  |  |  |  |
Mutual funds | 692 |  |  | — |  |  | — |  |  | 692 |
Common/collective trust at net asset value (1) | — |  |  | — |  |  | — |  |  | 216,962 |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |
Common/collective trust at net asset value (1) | — |  |  | — |  |  | — |  |  | 500,637 |
Partnership and joint venture interests measured at net asset value (1) | — |  |  | — |  |  | — |  |  | 101,954 |
Other assets measured at net asset value (1) | — |  |  | — |  |  | — |  |  | 1,947 |
Total | $ | 8,116 |  |  | $ | — |  |  | $ | — |  |  | $ | 829,616 |
| 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in thousands)
Cash and cash equivalents | $ | 9,988 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,988 |
Equities: |  |  |  |  |  |  |  |  |  |  |
Mutual funds | 459 |  |  | — |  |  | — |  |  | 459 |
Common/collective trust at net asset value (1) | — |  |  | — |  |  | — |  |  | 231,228 |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |
Common/collective trust at net asset value (1) | — |  |  | — |  |  | — |  |  | 535,185 |
Partnership and joint venture interests measured at net asset value (1) | — |  |  | — |  |  | — |  |  | 96,994 |
Other assets measured at net asset value (1) | — |  |  | — |  |  | — |  |  | 1,966 |
Total | $ | 10,447 |  |  | $ | — |  |  | $ | — |  |  | $ | 875,820 |
(1) In accordance with ASC Topic 820-10, Fair Value Measurements, certain assets that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in the tables above are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of net assets.
Schedule of multiemployer plans | Our participation in the Co-op Plan for the years ended August 31, 2018, 2017, and 2016 is outlined in the table below:
|  |  |  | Contributions of CHS |  |  |  |
|  |  |  | (Dollars in thousands) |  |  |  |
Plan Name |  | EIN/Plan Number |  | 2018 |  | 2017 |  | 2016 |  | Surcharge Imposed |  | Expiration Date of Collective Bargaining Agreement
Co-op Retirement Plan |  | 01-0689331 / 001 |  | $ | 1,662 |  |  | $ | 1,653 |  |  | $ | 1,862 |  |  | N/A |  | N/A

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