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Benefit Plans (Tables) | 12 Months Ended
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Mar. 31, 2023
Notes To Financial Statements [Abstract] |
Schedule of Defined Benefit Plans Disclosures |
| Defined Benefit Pension Plans |  | Other Post-Retirement Benefits Plan
| 2023 |  | 2022 |  | 2023 |  | 2022
Change in Benefit Obligations: |  |  |  |  |  |  |
Benefit Obligations at Beginning of Year | $ | 129,772 |  |  | $ | 149,200 |  |  | $ | 8,525 |  |  | $ | 10,016 |
Service cost | 1,276 |  |  | 1,616 |  |  | — |  |  | — |
Interest cost | 3,054 |  |  | 2,820 |  |  | 256 |  |  | 232 |
Actuarial loss (gain) | (27,046) |  |  | (12,177) |  |  | (807) |  |  | (640) |
Benefits and expenses | (5,817) |  |  | (5,375) |  |  | (783) |  |  | (1,083) |
Employee contributions | 501 |  |  | 897 |  |  | — |  |  | — |
Curtailments/settlements | (421) |  |  | (1,334) |  |  | — |  |  | — |
Impact of foreign currency exchange rate changes | (7,679) |  |  | (5,875) |  |  | — |  |  | — |
Benefit Obligations at End of Year | 93,640 |  |  | 129,772 |  |  | 7,191 |  |  | 8,525 |
Change in Plan Assets: |  |  |  |  |  |  |
Fair Value of Plan Assets at Beginning of Year | 142,172 |  |  | 145,452 |  |  | — |  |  | — |
Actual return on plan assets | (25,828) |  |  | 3,421 |  |  | — |  |  | — |
Employer contributions | 4,936 |  |  | 5,533 |  |  | 783 |  |  | 1,083 |
Employee contributions | 501 |  |  | 897 |  |  | — |  |  | — |
Benefits and expenses paid | (5,772) |  |  | (5,325) |  |  | (783) |  |  | (1,083) |
Curtailments/settlements | (421) |  |  | (1,334) |  |  | — |  |  | — |
Impact of foreign currency exchange rate changes | (8,499) |  |  | (6,472) |  |  | — |  |  | — |
Fair Value of Plan Assets at End of Year | 107,089 |  |  | 142,172 |  |  | — |  |  | — |
Funded Status of the Plans | $ | 13,449 |  |  | $ | 12,400 |  |  | $ | (7,191) |  |  | $ | (8,525) |
Schedule of Accrued Liabilities | Amounts recognized in the consolidated balance sheets consist of the following:
|  | Defined Benefit Pension Plans |  | Other Post-Retirement Benefits Plan
|  | 2023 |  | 2022 |  | 2023 |  | 2022
Non-current assets |  | $ | 16,325 |  |  | $ | 14,172 |  |  | $ | — |  |  | $ | — |
Current liabilities |  | — |  |  | — |  |  | (1,121) |  |  | (1,190) |
Non-current liabilities |  | (2,876) |  |  | (1,772) |  |  | (6,070) |  |  | (7,335) |
Net assets (liabilities) |  | $ | 13,449 |  |  | $ | 12,400 |  |  | $ | (7,191) |  |  | $ | (8,525) |
Schedule of Accumulated and Projected Benefit Obligations | Defined benefit plans with an accumulated benefit obligation and projected benefit obligation exceeding the fair value of plan assets had the following plan assets and obligations at March 31, 2023 and 2022:
|  | Defined Benefit Pension Plans
|  | 2023 |  | 2022
Aggregate fair value of plan assets |  | $ | 107,089 |  |  | $ | 142,172 |
Aggregate accumulated benefit obligations |  | 93,640 |  |  | 129,772 |
Aggregate projected benefit obligations |  | 93,640 |  |  | 129,772 |
Components of Net Periodic Benefits Cost and Other Amounts Recognized in Other Comprehensive Income [Table Text Block] | Components of the annual net periodic benefit cost of our defined benefit pension plans and our other post-retirement benefits plan were as follows:
|  | Defined Benefit Pension Plans |  | Other Post-Retirement Benefits Plan
|  | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021
Service cost |  | $ | 1,276 |  |  | $ | 1,616 |  |  | $ | 1,357 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  | 3,054 |  |  | 2,699 |  |  | 2,628 |  |  | 256 |  |  | 232 |  |  | 317 |
Expected return on plan assets |  | (3,817) |  |  | (4,412) |  |  | (3,463) |  |  | — |  |  | — |  |  | — |
Prior service cost recognition |  | 48 |  |  | 61 |  |  | 71 |  |  | — |  |  | (267) |  |  | (3,263) |
Net amortization and deferral |  | 19 |  |  | 18 |  |  | 21 |  |  | 329 |  |  | 444 |  |  | 439 |
Curtailments/settlements |  | (49) |  |  | (31) |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit (credit) cost |  | $ | 531 |  |  | $ | (49) |  |  | $ | 614 |  |  | $ | 585 |  |  | $ | 409 |  |  | $ | (2,507) |
Recognized in other comprehensive loss (income) before tax: |  |  |  |  |  |  |  |  |  |  |  |
Net loss (gain) occurring during year |  | $ | 1,716 |  |  | $ | (11,028) |  |  | $ | (1,635) |  |  | $ | 807 |  |  | $ | 640 |  |  | $ | 114 |
Amortization of prior service credit |  | (263) |  |  | (222) |  |  | (85) |  |  | — |  |  | 267 |  |  | 3,263 |
Amortization of net loss |  | — |  |  | — |  |  | 7 |  |  | (329) |  |  | (444) |  |  | (439) |
Total recognized in other comprehensive loss (income) |  | 1,453 |  |  | (11,250) |  |  | (1,713) |  |  | 478 |  |  | 463 |  |  | 2,938 |
Total recognized in total benefits cost and other comprehensive loss (income) |  | $ | 1,984 |  |  | $ | (11,299) |  |  | $ | (1,099) |  |  | $ | 1,063 |  |  | $ | 872 |  |  | $ | 431 |
Schedule of Assumptions Used | The following table presents significant assumptions used to determine the projected benefit obligations at March 31:
|  | 2023 |  | 2022
Discount Rate: |  |  |  |
Synergy Health plc Retirement Benefits Scheme |  | 4.70 | % |  | 2.80 | %
Isotron BV Pension Plan |  | 3.70 | % |  | 1.80 | %
Synergy Health Daniken AG |  | 2.05 | % |  | 0.90 | %
Synergy Health Radeberg |  | 3.80 | % |  | 1.60 | %
Synergy Health Allershausen |  | 3.70 | % |  | 1.50 | %
Harwell Dosimeters Ltd Retirement Benefits Scheme |  | 4.80 | % |  | 2.85 | %
Other post-retirement plan |  | 4.75 | % |  | 3.25 | %
Schedule of Net Benefit Costs | The following table presents significant assumptions used to determine the net periodic benefit costs for the years ended March 31:
|  | 2023 |  | 2022 |  | 2021
Discount Rate: |  |  |  |  |  |
Synergy Health plc Retirement Benefits Scheme |  | 2.80 | % |  | 2.10 | % |  | 2.40 | %
Isotron BV Pension Plan |  | 1.80 | % |  | 0.90 | % |  | 1.60 | %
Synergy Health Daniken AG |  | 2.05 | % |  | 1.00 | % |  | 0.70 | %
Synergy Health Radeberg |  | 2.00 | % |  | 1.50 | % |  | 1.50 | %
Synergy Health Allershausen |  | 2.20 | % |  | 2.00 | % |  | 1.75 | %
Harwell Dosimeters Ltd Retirement Benefits Scheme |  | 4.80 | % |  | 2.85 | % |  | 2.15 | %
Other post-retirement plan |  | 3.25 | % |  | 2.50 | % |  | 3.00 | %
Expected Return on Plan Assets: |  |  |  |  |  |
Synergy Health plc Retirement Benefits Scheme |  | 3.20 | % |  | 3.60 | % |  | 3.50 | %
Isotron BV Pension Plan |  | 1.80 | % |  | 0.90 | % |  | 1.60 | %
Synergy Health Daniken AG |  | 1.95 | % |  | 1.00 | % |  | 0.70 | %
Schedule of Health Care Cost Trend Rates | The assumed rates of increase generally decline ratably over a five-year period from the assumed current year healthcare cost trend rate to the assumed long-term healthcare cost trend rate noted below.
|  | 2023 |  | 2022 |  | 2021
Healthcare cost trend rate – medical |  | 7.50 | % |  | 7.00 | % |  | 7.00 | %
Healthcare cost trend rate – prescription drug |  | 7.50 | % |  | 7.00 | % |  | 7.00 | %
Long-term healthcare cost trend rate |  | 4.50 | % |  | 4.50 | % |  | 4.50 | %
To determine the healthcare cost trend rates, we evaluate a combination of information, including ongoing claims cost monitoring, annual statistical analyses of claims data, reconciliation of forecasted claims against actual claims, review of trend assumptions of other plan sponsors and national health trends, and adjustments for plan design changes, workforce changes, and changes in plan participant behavior.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The fair value of our pension benefits plan assets at March 31, 2023 and 2022 by asset category is as follows:
|  | Fair Value Measurements at March 31, 2023
(In thousands) |  | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Other Unobservable Inputs (Level 3)
Cash |  | $ | 338 |  |  | $ | 338 |  |  | $ | — |  |  | $ | — |
Insured annuities |  | 10,285 |  |  | — |  |  | 10,285 |  |  | — |
Insurance contracts |  | 5,387 |  |  | — |  |  | — |  |  | 5,387 |
Common and collective trusts valued at net asset value: |  |  |  |  |  |  |  |
Equity security trusts |  | 48,137 |  |  | — |  |  | — |  |  | — |
Debt security trusts |  | 42,942 |  |  | — |  |  | — |  |  | — |
Total Plan Assets |  | $ | 107,089 |  |  | $ | 338 |  |  | $ | 10,285 |  |  | $ | 5,387 |
|  | Fair Value Measurements at March 31, 2022
(In thousands) |  | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Other Unobservable Inputs (Level 3)
Cash |  | $ | 559 |  |  | $ | 559 |  |  | $ | — |  |  | $ | — |
Insured annuities |  | 14,231 |  |  | — |  |  | 14,231 |  |  | — |
Insurance contracts |  | 5,383 |  |  | — |  |  | — |  |  | 5,383 |
Common and collective trusts valued at net asset value: |  |  |  |  |  |  |  |
Equity security trusts |  | 66,416 |  |  | — |  |  | — |  |  | — |
Debt security trusts |  | 55,583 |  |  | — |  |  | — |  |  | — |
Total Plan Assets |  | $ | 142,172 |  |  | $ | 559 |  |  | $ | 14,231 |  |  | $ | 5,383 |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] | The fair value measurement of plan assets using significant unobservable inputs (Level 3) changed during fiscal year 2023 due to the following:
|  | Insurance contracts
Balance at March 31, 2021 |  | $ | 5,555 |
Gains (losses) related to assets still held at year-end |  | (115) |
Transfers out of Level 3 |  | (210) |
Foreign currency |  | 153 |
Balance at March 31, 2022 |  | $ | 5,383 |
Gains (losses) related to assets still held at year-end |  | (157) |
Transfers out of Level 3 |  | 320 |
Foreign currency |  | (159) |
Balance at March 31, 2023 |  | $ | 5,387 |
Schedule of Expected Benefit Payments | Based upon the actuarial assumptions utilized to develop our benefit obligations at March 31, 2023, the following benefit payments are expected to be made to plan participants:
|  | Other Defined Benefit Pension Plans |  | Other Post-Retirement Benefits Plan
2024 |  | $ | 6,279 |  |  | $ | 1,121 |
2025 |  | 6,265 |  |  | 1,019 |
2026 |  | 6,458 |  |  | 913 |
2027 |  | 6,663 |  |  | 823 |
2028 |  | 6,845 |  |  | 731 |
2029 and thereafter |  | 37,315 |  |  | 2,620 |

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