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Pension and Other Benefit Plans (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |  |  |
Total liabilities | $ 912,904,000 | $ 620,283,000 |  |
Accrued liabilities | 118,187,000 | 110,816,000 |  |
Other non-current liabilities | 192,610,000 | 191,920,000 |  |
Charge recorded for contributions to defined contribution plans | 4,540,000 | 4,063,000 | $ 5,239,000 |
Fair value of plan assets at beginning of year | 286,678,000 |  |  |
Fair value of plan assets at end of year | 271,985,000 | 286,678,000 |  |
(Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets at beginning of year | 1,169,000 |  |  |
Fair value of plan assets at end of year | 1,160,000 | 1,169,000 |  |
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | 29,230,000 | 51,540,000 |  |
Defined Benefit Plan, Benefit Obligation | 356,974,000 | 404,841,000 | 459,866,000 |
Curtailment charge | 0 | (19,038,000) | $ 0 |
Employer contribution | $ 5,442,000 | $ 1,316,000 |  |
Discount rate | 3.35% | 2.62% | 2.79% |
Net periodic pension cost (benefit) | $ (470,000) | $ 22,104,000 | $ 2,290,000 |
Fair value of plan assets at beginning of year | 286,678,000 | 313,366,000 |  |
Fair value of plan assets at end of year | 271,985,000 | 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 | 121,110,000 | 283,280,000 |  |
Investment Holdings [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan | 2,176,000 | 3,910,000 |  |
Pension Plans | (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fixed income securities investment return | 21,000 |  |  |
Disbursements | $ 30,000 |  |  |
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Retirement age | 65 years |  |  |
Percentage of premium contributed | 100.00% |  |  |
Net periodic pension cost (benefit) | $ 187,000 |  |  |
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) | 132,000 |  |  |
Total liabilities | 4,645,000 |  |  |
Accrued liabilities | 4,452,000 |  |  |
Other non-current liabilities | 193,000 |  |  |
Cash Surrender Value of Life Insurance | $ 3,590,000 | $ 3,496,000 |  |
Maximum [Member] | Equity Securities [Member] | Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  |  |  | 13.00%
Maximum [Member] | Fixed Income Securities [Member] | Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  |  |  | 87.00%
Minimum | Equity Securities [Member] | Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  |  |  | 23.00%
Minimum | Fixed Income Securities [Member] | Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  |  |  | 77.00%

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