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Pension and Other Benefit Plans (Narrative) (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  |  |  |  | 100.00% |
Total liabilities |  |  |  |  | $ 620,283,000 | $ 629,687,000
Accrued liabilities |  |  |  |  | 110,816,000 | 93,585,000
Other non-current liabilities |  |  |  |  | 191,920,000 | 227,507,000
Charge recorded for contributions to defined contribution plans | $ 4,063,000 | $ 5,239,000 | $ 5,260,000 |  |  |
Fair value of plan assets at beginning of year | 313,366,000 |  |  |  |  |
Fair value of plan assets at end of year | 313,366,000 |  |  |  | 286,678,000 | 313,366,000
(Level 3) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets at beginning of year | 5,503,000 |  |  |  |  |
Fair value of plan assets at end of year | 5,503,000 |  |  |  | 1,169,000 | 5,503,000
Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax |  |  |  |  | 51,540,000 | 105,878,000
Defined Benefit Plan, Benefit Obligation |  |  | 446,397,000 |  | $ 404,841,000 | $ 459,866,000
Curtailment charge | (19,038,000) | 0 | $ 0 |  |  |
Employer contribution | 1,316,000 | 10,967,000 |  |  |  |
Assumed percentage increase for healthcare costs |  |  |  |  | 6.00% |
Ultimate healthcare trend rate in five years |  |  |  |  | 4.50% |
Discount rate |  |  | 3.42% |  | 2.62% | 2.79%
Net periodic pension cost (benefit) | 22,104,000 | 2,290,000 | $ 489,000 |  |  |
Fair value of plan assets at beginning of year | 313,366,000 | 321,902,000 |  |  |  |
Fair value of plan assets at end of year | 313,366,000 | 321,902,000 | 321,902,000 |  | $ 286,678,000 | $ 313,366,000
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets |  |  |  |  | 283,280,000 | 257,093,000
Investment Holdings [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan | 3,910,000 |  |  |  |  |
Pension Plans | (Level 3) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fixed income securities investment return | 6,000 |  |  |  |  |
Disbursements | $ 4,340,000 |  |  |  |  |
Postretirement Benefit Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax |  |  |  |  | 1,467,000 | 1,417,000
Defined Benefit Plan, Benefit Obligation |  |  | 2,348,000 |  | $ 1,388,000 | $ 1,887,000
Retirement age | 65 years |  |  |  |  |
Percentage of premium contributed | 100.00% |  |  |  |  |
Discount rate |  |  |  |  | 2.52% | 3.17%
Net periodic pension cost (benefit) | $ (217,000) | $ (134,000) | $ (64,000) |  |  |
Postretirement Benefit Plans | American Association of Retired Persons |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employer contribution | 35 |  |  |  |  |
Defined Benefit Postretirement Life Insurance |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic pension cost (benefit) | $ 141,000 |  |  |  |  |
Total liabilities |  |  |  |  | $ 4,682,000 |
Accrued liabilities |  |  |  |  | 4,544,000 |
Other non-current liabilities |  |  |  |  | 138,000 |
Cash Surrender Value of Life Insurance |  |  |  |  | $ 3,496,000 | $ 3,346,000
Maximum [Member] | Equity Securities [Member] | Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  |  |  | 35.00% |  |
Maximum [Member] | Fixed Income Securities [Member] | Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  |  |  | 65.00% |  |
Minimum | Equity Securities [Member] | Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  |  |  | 45.00% |  |
Minimum | Fixed Income Securities [Member] | Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  |  |  | 55.00% |  |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: 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=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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