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Benefit Plans (Tables)
 12 Months Ended
Mar. 31, 2022
Notes To Financial Statements [Abstract]  
Schedule of Expected Benefit Payments Based upon the actuarial assumptions utilized to develop our benefit obligations at March 31, 2022, the following benefit payments are expected to be made to plan participants:
  
Other Defined Benefit Pension Plans
Other Post-Retirement Benefits Plan
2023$5,560 $1,190 
20245,542 1,067 
20255,721 966 
20265,882 880 
20276,060 788 
2028-203333,250 2,871 
Schedule of Accrued Liabilities Amounts recognized in the consolidated balance sheets consist of the following:
 Defined Benefit Pension PlansOther Post-Retirement Benefits Plan
  2022202120222021
Non-current assets$14,172 $— $— $— 
Current liabilities— — (1,190)(1,326)
Non-current liabilities(1,772)(3,748)(7,335)(8,690)
Net assets (liabilities)$12,400 $(3,748)$(8,525)$(10,016)
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, 2022 and 2021:
 Defined Benefit Pension Plans
  
20222021
Aggregate fair value of plan assets$142,172 $145,452 
Aggregate accumulated benefit obligations129,772 149,200 
Aggregate projected benefit obligations129,772 149,200 
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 PlansOther Post-Retirement Benefits Plan
  202220212020202220212020
Service cost$1,616 $1,357 $1,380 $— $— $— 
Interest cost2,699 2,628 2,876 232 317 409 
Expected return on plan assets(4,412)(3,463)(4,735)— — — 
Prior service cost recognition61 71 69 (267)(3,263)(3,263)
Net amortization and deferral18 21 9 444 439 482 
Curtailments/settlements(31)— — 
Net periodic benefit (credit) cost$(49)$614 $(401)$409 $(2,507)$(2,372)
Recognized in other comprehensive loss (income) before tax:
Net loss (gain) occurring during year$(11,028)$(1,635)$890 $640 $114 $(181)
Amortization of prior service credit(222)(85)(78)267 3,263 3,263 
Amortization of net loss— 7 — (444)(439)(482)
Total recognized in other comprehensive loss (income)(11,250)(1,713)812 463 2,938 2,600 
Total recognized in total benefits cost and other comprehensive loss (income)$(11,299)$(1,099)$411 $872 $431 $228 
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:
  
202220212020
Discount Rate:
   Synergy Health plc Retirement Benefits Scheme2.10 %2.40 %2.50 %
   Isotron BV Pension Plan0.90 %1.60 %1.20 %
   Synergy Health Daniken AG1.00 %0.70 %0.20 %
   Synergy Health Radeberg1.50 %1.50 %1.60 %
   Synergy Health Allershausen2.00 %1.75 %1.75 %
              Harwell Dosimeters Ltd Retirement Benefits Scheme2.85 %2.15 %2.45 %
   Other post-retirement plan 2.50 %3.00 %3.50 %
Expected Return on Plan Assets:
   Synergy Health plc Retirement Benefits Scheme3.60 %3.50 %4.80 %
   Isotron BV Pension Plan0.90 %1.60 %1.20 %
   Synergy Health Daniken AG1.00 %0.70 %0.65 %
Schedule of Assumptions Used The following table presents significant assumptions used to determine the projected benefit obligations at March 31:
  
20222021
Discount Rate:
   Synergy Health plc Retirement Benefits Scheme2.80 %2.10 %
   Isotron BV Pension Plan1.80 %0.90 %
   Synergy Health Daniken AG0.90 %0.35 %
   Synergy Health Radeberg1.60 %1.60 %
   Synergy Health Allershausen1.50 %0.80 %
   Harwell Dosimeters Ltd Retirement Benefits Scheme2.85 %2.15 %
   Other post-retirement plan3.25 %2.50 %
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.
  
202220212020
Healthcare cost trend rate – medical7.00 %7.00 %6.75 %
Healthcare cost trend rate – prescription drug7.00 %7.00 %6.75 %
Long-term healthcare cost trend rate4.50 %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, 2022 and 2021 by asset category is as follows:
 
Fair Value Measurements at March 31, 2022
(In thousands)TotalQuoted
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 annuities14,231 — 14,231 — 
Insurance contracts5,383 — — 5,383 
Common and collective trusts valued at net asset value:
    Equity security trusts66,416 — — — 
    Debt security trusts55,583 — — — 
Total Plan Assets$142,172 $559 $14,231 $5,383 
 
Fair Value Measurements at March 31, 2021
(In thousands)TotalQuoted
Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Other
Unobservable
Inputs
(Level 3)
Cash$657 $657 $— $— 
Insured annuities17,950 — 17,950 — 
Insurance contracts5,555 — — 5,555 
Common and collective trusts valued at net asset value:
    Equity security trusts60,960 — — — 
    Debt security trusts60,330 — — — 
Total Plan Assets$145,452 $657 $17,950 $5,555 
Schedule of Defined Benefit Plans Disclosures
 Defined Benefit Pension PlansOther
Post-Retirement
Benefits Plan
2022202120222021
Change in Benefit Obligations:
Benefit Obligations at Beginning of Year$149,200 $123,190 $10,016 $11,368 
Service cost1,616 1,357 — — 
Interest cost2,820 2,816 232 317 
Actuarial loss (gain)(12,177)12,622 (640)(114)
Benefits and expenses(5,375)(4,714)(1,083)(1,555)
Employee contributions897 1,031 — — 
Curtailments/settlements(1,334)— — — 
Impact of foreign currency exchange rate changes (5,875)12,898 — — 
Benefit Obligations at End of Year129,772 149,200 8,525 10,016 
Change in Plan Assets:
Fair Value of Plan Assets at Beginning of Year145,452 112,203 — — 
Actual return on plan assets3,421 19,252 — — 
Employer contributions5,533 5,329 1,083 1,555 
Employee contributions897 1,031 — — 
Benefits and expenses paid(5,325)(4,714)(1,083)(1,555)
Curtailments/settlements(1,334)— — — 
Impact of foreign currency exchange rate changes(6,472)12,351 — — 
Fair Value of Plan Assets at End of Year142,172 145,452 — — 
Funded Status of the Plans$12,400 $(3,748)$(8,525)$(10,016)
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 2022 due to the following:
Insurance contracts
Balance at March 31, 2020$4,345 
    Gains (losses) related to assets still held at year-end197 
    Transfers out of Level 3853 
    Foreign currency160 
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 currency153 
Balance at March 31, 2022$5,383