XML 53 R37.htm IDEA: XBRL DOCUMENT
v3.21.2

EMPLOYEE BENEFIT PLANS (Tables) | 9 Months Ended
--- | ---
Jun. 30, 2021
Retirement Benefits [Abstract] |
Components of Net Periodic Cost | The components of the net periodic cost for pension benefits, including the Company's Pension Equalization Plan, and OPEB costs (principally health care and life insurance) for employees and covered dependents were as follows:
| Pension | OPEB
| Three Months Ended | Nine Months Ended | Three Months Ended | Nine Months Ended
| June 30, | June 30, | June 30, | June 30,
(Thousands) | 2021 | 2020 | 2021 | 2020 | 2021 | 2020 | 2021 | 2020
Service cost | $ | 2,182 |  | $ | 2,056 |  | $ | 6,547 |  | $ | 6,167 |  | $ | 1,211 |  | $ | 1,213 |  | $ | 3,633 |  | $ | 3,640 |
Interest cost | 2,278 |  | 2,647 |  | 6,834 |  | 7,940 |  | 1,518 |  | 1,757 |  | 4,553 |  | 5,270 |
Expected return on plan assets | (5,037) |  | (5,145) |  | (15,112) |  | (15,434) |  | (1,625) |  | (1,628) |  | (4,873) |  | (4,883) |
Recognized actuarial loss | 2,862 |  | 2,606 |  | 8,585 |  | 7,818 |  | 1,978 |  | 1,861 |  | 5,933 |  | 5,582 |
Prior service cost (credit) amortization | 25 |  | 25 |  | 76 |  | 76 |  | (44) |  | (49) |  | (134) |  | (148) |
Net periodic benefit cost | $ | 2,310 |  | $ | 2,189 |  | $ | 6,930 |  | $ | 6,567 |  | $ | 3,038 |  | $ | 3,154 |  | $ | 9,112 |  | $ | 9,461 |

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration