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Net Periodic Benefit Cost (Narratives) (Details) - USD ($) shares in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Effect of dilutive employee stock options and other share-based awards | 276 | 129 | 268 | 152 |
Average basic shares outstanding | 28,725 | 28,619 | 28,694 | 28,581 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | $ 40,000 | $ 0 | $ 81,000 | $ 0 |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  | 748 | 718 |
Pension Plans, Defined Benefiit |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service costs | 125,000 | 157,000 | $ 253,000 | $ 337,000 |
Interest cost | 3,460,000 | 2,819,000 | 6,932,000 | 5,689,000 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (2,946,000) | (2,708,000) | (5,892,000) | (5,421,000) |
Net amortization | 103,000 | 207,000 | 204,000 | 415,000 |
Net periodic pension (benefit) cost | $ 782,000 | $ 475,000 | $ 1,578,000 | $ 1,020,000 |
Forecast [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  |  |  |  | $ 6,744,000

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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 https://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 https://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 https://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 https://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 https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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