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v3.23.1

Benefit Plans (Components of the annual net periodic benefit cost) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | $ 750 |  |
Other Postretirement Benefit Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (807) | $ (640) |
Defined Benefit Plan, Service Cost | 0 | 0 | $ 0
Defined Benefit Plan, Interest Cost | 256 | 232 | 317
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 0 | 0 | 0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 0 | (267) | (3,263)
Net amortization and deferral | 329 | 444 | 439
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 585 | 409 | (2,507)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | 0 | 0 | 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | 807 | 640 | 114
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) | 0 | 267 | 3,263
Defined Benefit Plan, Amortization of Net Gains (Losses) | (329) | (444) | (439)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax | 478 | 463 | 2,938
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax | 1,063 | 872 | 431
Other Defined Benefit Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (27,046) | (12,177) |
Defined Benefit Plan, Service Cost | 1,276 | 1,616 | 1,357
Defined Benefit Plan, Interest Cost | 3,054 | 2,699 | 2,628
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (3,817) | (4,412) | (3,463)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 48 | 61 | 71
Net amortization and deferral | 19 | 18 | 21
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 531 | (49) | 614
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | (49) | (31) | 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | 1,716 | (11,028) | (1,635)
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) | (263) | (222) | (85)
Defined Benefit Plan, Amortization of Net Gains (Losses) | 0 | 0 | 7
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax | 1,453 | (11,250) | (1,713)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax | $ 1,984 | $ (11,299) | $ (1,099)

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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