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Pension And Other Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Revised healthcare cost trend assumption | 7.60% |  |
Ultimate healthcare cost trend rate | 4.50% |  |
Year that rate reaches healthcare cost trend rate | 2028 |  |
Net actuarial loss expected in net periodic benefit cost during next fiscal year | $ 5,100 |  |
Prior service benefit expected in net periodic benefit cost during next fiscal year | $ 2,200 |  |
Percentage of total plan assets | 94.00% |  |
Percentage of total projected benefit obligation | 84.00% |  |
Expected company contributions in next fiscal year | $ 2,000 |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | 2,600 | $ 2,300 | $ 2,600
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Funded status of the plans, end of year | $ 33,220 | $ 44,090 |
Percentage of funded status of plans | 97.00% |  |
Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Revised healthcare cost trend assumption | 7.60% | 8.10% | 6.70%
Funded status of the plans, end of year | $ 27,918 | $ 29,478 |
Percentage of funded status of plans | 95.00% |  |
ERISA-regulated U.S. plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected company contributions in next fiscal year | $ 0 |  |

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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + 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 (l) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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