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Employee Benefit Plans (Narratives) (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Compensation of related costs, Share-based Payments [Abstract] |  |  |
Employee stock ownership plan (ESOP), compensation expense | $ 10,300,000 | $ 11,300,000 | $ 11,400,000
Employee stock ownership plan (ESOP), cash contributions to ESOP | 5,600,000 | 1,000,000.0 | 1,000,000.0
Cash contributions to ESOP non leveraged | 4,000,000.0 | $ 5,200,000 | $ 11,000,000.0
Unallocated common stock dividend, debt repayment | $ 0.0 |  |
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Defined benefit plan, health care cost trend rate assumed for next fiscal year | 6.50% | 6.90% |
Defined benefit plan, ultimate health care cost trend rate | 4.50% | 4.50% |
Defined benefit plan, effect of one percentage point increase on accumulated postretirement benefit obligation | $ 246 |  |
Defined benefit plan, effect of one percentage point increase on service and interest cost components | 25 |  |
Defined benefit plan, effect of one percentage point decrease on accumulated postretirement benefit obligation | 278 |  |
Defined benefit plan, effect of one percentage point decrease on service and interest cost components | 29 |  |
Post retirement health insurance [Member] |  |  |
Deferred Compensation Arrangements [Abstract] |  |  |
Lifetime maximum benefit paid per individual | 20,000 |  |
Post retirement life insurance [Member] |  |  |
Deferred Compensation Arrangements [Abstract] |  |  |
Lifetime maximum benefit paid per individual | 3,000 |  |
Additional benefit requirement amount | $ 100 |  |

X
- Definition Additional amount provided to retiree's for each year of server over ten years. + References No definition available. + Details
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- Definition This item represents the non leveraged amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). + References No definition available. + Details
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- Definition The maximum amount an individual receives as an insurance benefit after completing the requisite number of years of service and having reached the requisite age. + References No definition available. + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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=118255775&loc=d3e1928-114920 + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + 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=118255775&loc=d3e1928-114920 + Details
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- Definition This item represents the amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition The amount of cash provided by the employer through contributions or dividends that the ESOP used in the period to repay debt and interest on a third-party loan made directly to the ESOP. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244457&loc=d3e16545-113920 + Details
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