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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
Summary of Changes in Funded Status of Plans and Liabilities Recognized | The following summarizes the changes in the funded status of the plans and the related liabilities recognized on the Consolidated Balance Sheets as of September 30:
| Pension (1) | OPEB
(Thousands) | 2020 | 2019 | 2020 | 2019
Change in Benefit Obligation |  |  |  |
Benefit obligation at beginning of year | $ | 360,477 |  | $ | 298,575 |  | $ | 260,003 |  | $ | 196,785 |
Service cost | 8,223 |  | 7,381 |  | 4,854 |  | 4,404 |
Interest cost | 10,587 |  | 12,173 |  | 7,026 |  | 8,324 |
Plan participants’ contributions (2) | 25 |  | 43 |  | 194 |  | 210 |
Actuarial loss (gain) | 29,738 |  | 52,549 |  | (23,226) |  | 54,700 |
Benefits paid, net of retiree subsidies received | (11,886) |  | (10,244) |  | (2,989) |  | (4,420) |
Benefit obligation at end of year | $ | 397,164 |  | $ | 360,477 |  | $ | 245,862 |  | $ | 260,003 |
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year | $ | 288,634 |  | $ | 279,410 |  | $ | 83,925 |  | $ | 77,980 |
Actual return on plan assets | 30,632 |  | 19,194 |  | 6,872 |  | 2,499 |
Employer contributions | 596 |  | 231 |  | 8,436 |  | 7,926 |
Benefits paid, net of plan participants’ contributions (2) | (11,894) |  | (10,201) |  | (2,827) |  | (4,479) |
Fair value of plan assets at end of year | $ | 307,968 |  | $ | 288,634 |  | $ | 96,406 |  | $ | 83,926 |
Funded status | $ | (89,196) |  | $ | (71,843) |  | $ | (149,456) |  | $ | (176,077) |
Amounts recognized on Consolidated Balance Sheets |  |  |  |
Postemployment employee (liability) |  |  |  |
Current | $ | (531) |  | $ | (603) |  | $ | (900) |  | $ | (800) |
Noncurrent | (88,665) |  | (71,240) |  | (148,556) |  | (175,277) |
Total | $ | (89,196) |  | $ | (71,843) |  | $ | (149,456) |  | $ | (176,077) |
(1)Includes the Company’s PEP. (2)Prior to July 1, 1998, employees were eligible to elect an additional participant contribution to enhance their benefits and contributions made during the periods were insignificant.
Summary of Regulatory Assets and Accumulated Other Comprehensive Income | The following table summarizes the amounts recognized in regulatory assets and accumulated other comprehensive income as of September 30:
| Regulatory Assets |  | Accumulated Other Comprehensive Income (Loss)
| Pension | OPEB |  | Pension | OPEB
Balance at September 30, 2018 | $ | 66,233 |  | $ | 68,685 |  |  | $ | 14,633 |  | $ | 7,659 |
Amounts arising during the period: |  |  |  |  |
Net actuarial loss | 38,137 |  | 48,452 |  |  | 14,271 |  | 9,264 |
Amounts amortized to net periodic costs: |  |  |  |  |
Net actuarial (loss) | (4,662) |  | (5,820) |  |  | (1,103) |  | (648) |
Prior service credit | (102) |  | 312 |  |  | — |  | 53 |
Balance at September 30, 2019 | $ | 99,606 |  | $ | 111,629 |  |  | $ | 27,801 |  | $ | 16,328 |
Amounts arising during the period: |  |  |  |  |
Net actuarial loss (gain) | 11,953 |  | (21,974) |  |  | 7,731 |  | (1,614) |
Amounts amortized to net periodic costs: |  |  |  |  |
Net actuarial (loss) | (7,893) |  | (6,536) |  |  | (2,528) |  | (907) |
Prior service (cost) credit | (102) |  | 182 |  |  | — |  | 16 |
Balance at September 30, 2020 | $ | 103,564 |  | $ | 83,301 |  |  | $ | 33,004 |  | $ | 13,823 |
The amounts in regulatory assets and accumulated other comprehensive income not yet recognized as components of net periodic benefit cost as of September 30 are:
| Regulatory Assets | Accumulated Other Comprehensive Income (Loss)
| Pension | OPEB | Pension | OPEB
(Thousands) | 2020 | 2019 | 2020 | 2019 | 2020 | 2019 | 2020 | 2019
Net actuarial loss | $ | 103,197 |  | $ | 99,139 |  | $ | 83,600 |  | $ | 112,109 |  | $ | 33,004 |  | $ | 27,801 |  | $ | 13,847 |  | $ | 16,367 |
Prior service cost (credit) | 367 |  | 467 |  | (299) |  | (480) |  | — |  | — |  | (24) |  | (39) |
Total | $ | 103,564 |  | $ | 99,606 |  | $ | 83,301 |  | $ | 111,629 |  | $ | 33,004 |  | $ | 27,801 |  | $ | 13,823 |  | $ | 16,328 |
Schedule of Amounts Expected to be Recognized as Components of Net Periodic Benefit Cost | Amounts included in regulatory assets and accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost in fiscal 2021 are as follows:
| Regulatory Assets |  | Accumulated Other Comprehensive Income (Loss)
(Thousands) | Pension | OPEB |  | Pension | OPEB
Net actuarial loss | $ | 8,269 |  | $ | 6,846 |  |  | $ | 3,178 |  | $ | 1,064 |
Prior service cost (credit) | 102 |  | (166) |  |  | — |  | (13) |
Total | $ | 8,371 |  | $ | 6,680 |  |  | $ | 3,178 |  | $ | 1,051 |
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets | The accumulated benefit obligation for the pension plans, including the PEP, exceeded the fair value of plan assets. The projected benefit and accumulated benefit obligations and the fair value of plan assets as of September 30, are as follows:
| Pension
(Thousands) | 2020 | 2019
Projected benefit obligation | $ | 397,164 |  | $ | 360,477 |
Accumulated benefit obligation | $ | 352,320 |  | $ | 319,527 |
Fair value of plan assets | $ | 307,968 |  | $ | 288,634 |
Components of Net Periodic Cost | The components of the net periodic cost for pension benefits, including the Company’s PEP, and OPEB costs (principally health care and life insurance) for employees and covered dependents for fiscal years ended September 30, are as follows:
| Pension | OPEB
(Thousands) | 2020 | 2019 | 2018 | 2020 | 2019 | 2018
Service cost | $ | 8,223 |  | $ | 7,381 |  | $ | 8,139 |  | $ | 4,854 |  | $ | 4,404 |  | $ | 4,607 |
Interest cost | 10,587 |  | 12,173 |  | 10,493 |  | 7,026 |  | 8,324 |  | 6,365 |
Expected return on plan assets | (20,579) |  | (19,054) |  | (19,639) |  | (6,510) |  | (5,515) |  | (5,352) |
Recognized actuarial loss | 10,424 |  | 5,765 |  | 7,537 |  | 7,442 |  | 6,466 |  | 4,660 |
Prior service cost (credit) amortization | 102 |  | 102 |  | 106 |  | (197) |  | (365) |  | (365) |
Net periodic benefit cost | 8,757 |  | $ | 6,367 |  | $ | 6,636 |  | $ | 12,615 |  | $ | 13,314 |  | 9,915 |
Special termination benefit | — |  | — |  | 3,730 |  | — |  | — |  | 490 |
Net periodic benefit cost recognized as expense | $ | 8,757 |  | $ | 6,367 |  | $ | 10,366 |  | $ | 12,615 |  | $ | 13,314 |  | $ | 10,405 |
Schedule of Weighted Average Assumptions Used | The weighted average assumptions used to determine the Company’s benefit costs during the fiscal years below and obligations as of September 30, are as follows:
| Pension |  | OPEB |
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |
Benefit costs: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 3.37/3.35% | (1) | 4.36/4.35% | (1) | 4.04/4.03% | (1) | 3.48/3.44% | (1) | 4.38/4.37% | (1) | 4.12/4.08% | (1)
Expected asset return | 7.25 |  |  | 7.00 | % |  | 7.50 | % |  | 7.25 |  |  | 7.00 | % |  | 7.50 | % |
Compensation increase | 3.00/3.50% | (1) | 3.25/3.50% | (1) | 3.25/3.50% | (1) | 3.00/3.50% | (1) | 3.25/3.50% | (1) | 3.25/3.50% | (1)
Obligations: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 2.95/2.92% | (1) | 3.37/3.35% | (1) | 4.36/4.35% |  | 3.08/3.03% | (1) | 3.48/3.44% | (1) | 4.38/4.37% | (1)
Compensation increase | 3.00/3.50% | (1) | 3.00/3.50% | (1) | 3.25/3.50% | (1) | 3.00/3.50% | (1) | 3.00/3.50% | (1) | 3.25/3.50% | (1)
(1)Percentages for represented and nonrepresented plans, respectively.
Information on Assumed HCCTR Used to Determine Expected OPEB Benefits | Information relating to the assumed HCCTR used to determine expected OPEB benefits as of September 30, and the effect of a 1 percent change in the rate, are as follows:
($ in thousands) | 2020 |  | 2019 |  | 2018
HCCTR | 7.6% |  | 7.6% |  | 7.9%
Ultimate HCCTR | 4.5% |  | 4.5% |  | 4.5%
Year ultimate HCCTR reached | 2026 |  | 2026 |  | 2024
Effect of a 1 percentage point increase in the HCCTR on: |  |  |  |  |
Year-end benefit obligation | $ | 49,106 |  |  | $ | 49,061 |  |  | $ | 36,260 |
Total service and interest cost | $ | 2,799 |  |  | $ | 2,923 |  |  | $ | 2,482 |
Effect of a 1 percentage point decrease in the HCCTR on: |  |  |  |  |
Year-end benefit obligation | $ | (38,844) |  |  | $ | (38,747) |  |  | $ | (28,743) |
Total service and interest costs | $ | (2,151) |  |  | $ | (2,250) |  |  | $ | (1,937) |
Schedule of Mix and Targeted Allocation of Plan Assets | The mix and targeted allocation of the pension and OPEB plans’ assets are as follows:
| 2021 | Assets at
| Target | September 30,
Asset Allocation | Allocation | 2020 |  | 2019 |
U.S. equity securities | 34 | % |  | 38 | % |  | 37 | % |
International equity securities | 17 |  |  | 18 |  |  | 17 |  |
Fixed income | 38 |  |  | 39 |  |  | 42 |  |
Other assets | 11 |  |  | 5 |  |  | 4 |  |
Total | 100 | % |  | 100 | % |  | 100 | % |
Schedule of Expected Benefit Payments | The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid during the following fiscal years:
(Thousands) | Pension | OPEB
2021 | $ | 12,799 |  | $ | 6,179 |
2022 | $ | 13,765 |  | $ | 6,837 |
2023 | $ | 14,512 |  | $ | 7,420 |
2024 | $ | 15,345 |  | $ | 7,988 |
2025 | $ | 16,267 |  | $ | 8,625 |
2026 - 2030 | $ | 95,969 |  | $ | 52,480 |
Schedule of Estimated Subsidy Payments | The following estimated subsidy payments are expected to be paid during the following fiscal years:
| Estimated Subsidy
(Thousands) | Payment
2021 |  | $ | 292 |
2022 |  | $ | 316 |
2023 |  | $ | 349 |
2024 |  | $ | 384 |
2025 |  | $ | 420 |
2026 - 2030 |  | $ | 2,789 |
Summary of Pension and OPEB Assets Held in the Master Trust | Pension and OPEB assets held in the master trust, measured at fair value, as of September 30, are summarized as follows:
(Thousands) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total
As of September 2020: | Pension |  | OPEB
Assets |  |  |  |  |  |  |
Money market funds | $ | — |  |  | $ | — |  |  | $ | 15 |  |  | $ | 15 |
Registered Investment Companies: |  |  |  |  |  |  |
Equity Funds: |  |  |  |  |  |  |
Large Cap Index | 95,542 |  |  | 95,542 |  |  | 29,908 |  |  | 29,908 |
Extended Market Index | 21,085 |  |  | 21,085 |  |  | 6,470 |  |  | 6,470 |
International Stock | 56,912 |  |  | 56,912 |  |  | 17,390 |  |  | 17,390 |
Fixed Income Funds: |  |  |  |  |  |  |
Emerging Markets | 16,008 |  |  | 16,008 |  |  | 4,958 |  |  | 4,958 |
Core Fixed Income | — |  |  | — |  |  | 11,146 |  |  | 11,146 |
Opportunistic Income | — |  |  | — |  |  | 7,128 |  |  | 7,128 |
Ultra Short Duration | — |  |  | — |  |  | 7,057 |  |  | 7,057 |
High Yield Bond Fund | 26,303 |  |  | 26,303 |  |  | 8,223 |  |  | 8,223 |
Long Duration Fund | 77,036 |  |  | 77,036 |  |  | — |  |  | — |
Total assets at in the fair value hierarchy | $ | 292,886 |  |  | 292,886 |  |  | $ | 92,295 |  |  | 92,295 |
Investments measured at net asset value |  |  |  |  |  |  |
Common collective trusts |  |  | 15,082 |  |  |  |  | 4,111 |
Total assets at fair value |  |  | $ | 307,968 |  |  |  |  | $ | 96,406 |
(Thousands) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Total
As of September 30, 2019: | Pension |  | OPEB
Assets |  |  |  |  |  |  |
Money market funds | $ | — |  |  | $ | — |  |  | $ | 21 |  |  | $ | 21 |
Registered Investment Companies: |  |  |  |  |  |  |
Equity Funds: |  |  |  |  |  |  |
Large Cap Index | 89,374 |  |  | 89,374 |  |  | 25,474 |  |  | 25,474 |
Extended Market Index | 16,548 |  |  | 16,548 |  |  | 5,036 |  |  | 5,036 |
International Stock | 49,929 |  |  | 49,929 |  |  | 14,564 |  |  | 14,564 |
Fixed Income Funds: |  |  |  |  |  |  |
Emerging Markets | 15,794 |  |  | 15,794 |  |  | 4,764 |  |  | 4,764 |
Core Fixed Income | — |  |  | — |  |  | 10,570 |  |  | 10,570 |
Opportunistic Income | — |  |  | — |  |  | 6,365 |  |  | 6,365 |
Ultra Short Duration | — |  |  | — |  |  | 6,340 |  |  | 6,340 |
High Yield Bond Fund | 24,328 |  |  | 24,328 |  |  | 7,350 |  |  | 7,350 |
Long Duration Fund | 80,041 |  |  | 80,041 |  |  | — |  |  | — |
Total assets at in the fair value hierarchy | $ | 276,014 |  |  | 276,014 |  |  | $ | 80,484 |  |  | 80,484 |
Investments measured at net asset value |  |  |  |  |  |  |
Common collective trusts |  |  | 12,620 |  |  |  |  | 3,442 |
Total assets at fair value |  |  | $ | 288,634 |  |  |  |  | $ | 83,926 |

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