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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Amortization: |  |  |  |
Employer contribution | $ 15,000 |  |  |
Fixed Income Securities |  |  |  |
Amortization: |  |  |  |
Plan assets target allocation, percentage | 54.00% |  | 54.00% |
Defined Benefit Plan, Equity Securities |  |  |  |
Amortization: |  |  |  |
Plan assets target allocation, percentage | 39.00% |  | 39.00% |
Other Investments |  |  |  |
Amortization: |  |  |  |
Plan assets target allocation, percentage | 7.00% |  | 7.00% |
Pension |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | $ 2,020 | $ 2,170 | $ 6,216 | $ 6,510
Interest cost * | 1,560 | 1,933 | 4,654 | 5,799
Expected return on plan assets * | (2,761) | (2,232) | (8,286) | (6,696)
Amortization: |  |  |  |
Prior service cost | (46) | (47) | (104) | (141)
Net actuarial loss * | 2,730 | 2,386 | 8,774 | 7,159
Curtailment gain * | (220) | 0 | (220) | 0
Prior service cost write-off * | 526 | 0 | 526 | 0
Net benefit cost | 3,809 | 4,210 | 11,560 | 12,631
Contributions during the nine months ended June 30, 2021: |  |  |  |
Pension |  |  | 15,000 |
Other Postretirement |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | 50 | 64 | 150 | 192
Interest cost * | 94 | 140 | 282 | 420
Expected return on plan assets * | 0 | 0 | 0 | 0
Amortization: |  |  |  |
Prior service cost | (91) | (23) | (273) | (69)
Net actuarial loss * | 0 | 0 | 0 | 0
Curtailment gain * | 0 | 0 | 0 | 0
Prior service cost write-off * | 0 | 0 | 0 | 0
Net benefit cost | 53 | $ 181 | 159 | $ 543
Contributions during the nine months ended June 30, 2021: |  |  |  |
Other Postretirement |  |  | 436 |
Additional contributions expected in fiscal 2021: |  |  |  |
Additional contributions expected in fiscal 2021 | 395 |  | 395 |
Supplemental retirement plan |  |  |  |
Contributions during the nine months ended June 30, 2021: |  |  |  |
Pension |  |  | 607 |
Additional contributions expected in fiscal 2021: |  |  |  |
Additional contributions expected in fiscal 2021 | $ 298 |  | $ 298 |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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