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Benefit Plans
 12 Months Ended
Mar. 31, 2023
Notes To Financial Statements [Abstract]  
Benefit Plans
9.BENEFIT PLANS
In the United States, we sponsor an unfunded post-retirement welfare benefits plan for two groups of United States retirees. Benefits under this plan include retiree life insurance and retiree medical insurance, including prescription drug coverage.
During the second quarter of fiscal 2009, we amended our United States post-retirement welfare benefits plan, reducing the benefits to be provided to retirees under the plan and increasing their share of the costs. The amendments resulted in a decrease of $46,001 in the accumulated post-retirement benefit obligation. The impact of this change was recognized in our Consolidated Balance Sheets in fiscal 2009 and is being amortized as a component of the annual net periodic benefit cost over a period of approximately thirteen years.
We sponsor several defined benefit pension schemes outside the United States: two in the UK, one in the Netherlands, two in Germany, and one in Switzerland. The Synergy Health plc Retirement Benefit Scheme is a defined benefit (final salary) funded pension scheme. In previous years, Synergy sponsored a funded defined benefit arrangement in the Netherlands. This was a separate fund holding the pension scheme assets to meet long-term pension liabilities for past and present employees. Accrual of benefits ceased under the scheme effective January 1, 2013. The Synergy Radeberg and Synergy Allershausen Schemes are unfunded defined pension schemes and are closed to new entrants. The Synergy Daniken Scheme is a defined benefit funded pension scheme. As a result of our fiscal 2018 acquisition of Harwell Dosimeters Ltd, we also sponsor the Harwell Dosimeters Ltd Retirement Benefits Scheme which is a defined benefit funded pension scheme.
We recognize the funded status of our defined benefit pension and post-retirement benefit plans in our Consolidated Balance Sheets, with a corresponding adjustment to accumulated other comprehensive income, net of tax. The funded status is measured as of March 31 each year and is calculated as the difference between the fair value of plan assets and the benefit obligation (which is the projected benefit obligation for pension plans and the accumulated post-retirement benefit obligation for post-retirement benefit plans). Accumulated comprehensive income (loss) represents the net unrecognized actuarial losses and unrecognized prior service cost. These amounts will be recognized in net periodic benefit cost as they are amortized. We will recognize future changes to the funded status of these plans in the year the change occurs, through other comprehensive income.
Obligations and Funded Status.  The following table reconciles the funded status of the defined benefit pension plans and the other post-retirement benefits plan to the amounts recorded on our Consolidated Balance Sheets at March 31, 2023 and 2022, respectively. Benefit obligation balances presented in the following table reflect the projected benefit obligations for our defined benefit pension plans and the accumulated other post-retirement benefit obligation for our post-retirement benefits plan. The measurement date of our defined benefit pension plans and other post-retirement benefits plan is March 31, for both periods presented.
 Defined Benefit Pension PlansOther
Post-Retirement
Benefits Plan
2023202220232022
Change in Benefit Obligations:
Benefit Obligations at Beginning of Year$129,772 $149,200 $8,525 $10,016 
Service cost1,276 1,616 — — 
Interest cost3,054 2,820 256 232 
Actuarial loss (gain)(27,046)(12,177)(807)(640)
Benefits and expenses(5,817)(5,375)(783)(1,083)
Employee contributions501 897 — — 
Curtailments/settlements(421)(1,334)— — 
Impact of foreign currency exchange rate changes (7,679)(5,875)— — 
Benefit Obligations at End of Year93,640 129,772 7,191 8,525 
Change in Plan Assets:
Fair Value of Plan Assets at Beginning of Year142,172 145,452 — — 
Actual return on plan assets(25,828)3,421 — — 
Employer contributions4,936 5,533 783 1,083 
Employee contributions501 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 Year107,089 142,172 — — 
Funded Status of the Plans$13,449 $12,400 $(7,191)$(8,525)
Amounts recognized in the consolidated balance sheets consist of the following:
 Defined Benefit Pension PlansOther Post-Retirement Benefits Plan
  2023202220232022
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)
The pre-tax amount of unrecognized actuarial net loss and unamortized prior service cost included in accumulated other comprehensive (loss) at March 31, 2023, was approximately $750 and $(5,602), respectively.
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
  
20232022
Aggregate fair value of plan assets$107,089 $142,172 
Aggregate accumulated benefit obligations93,640 129,772 
Aggregate projected benefit obligations93,640 129,772 

Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income.  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
  202320222021202320222021
Service cost$1,276 $1,616 $1,357 $— $— $— 
Interest cost3,054 2,699 2,628 256 232 317 
Expected return on plan assets(3,817)(4,412)(3,463)— — — 
Prior service cost recognition48 61 71 — (267)(3,263)
Net amortization and deferral19 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 
Assumptions Used in Calculating Benefit Obligations and Net Periodic Benefit Cost.  The following table presents significant assumptions used to determine the projected benefit obligations at March 31:
  
20232022
Discount Rate:
   Synergy Health plc Retirement Benefits Scheme4.70 %2.80 %
   Isotron BV Pension Plan3.70 %1.80 %
   Synergy Health Daniken AG2.05 %0.90 %
   Synergy Health Radeberg3.80 %1.60 %
   Synergy Health Allershausen3.70 %1.50 %
   Harwell Dosimeters Ltd Retirement Benefits Scheme4.80 %2.85 %
   Other post-retirement plan4.75 %3.25 %
The following table presents significant assumptions used to determine the net periodic benefit costs for the years ended March 31:
  
202320222021
Discount Rate:
   Synergy Health plc Retirement Benefits Scheme2.80 %2.10 %2.40 %
   Isotron BV Pension Plan1.80 %0.90 %1.60 %
   Synergy Health Daniken AG2.05 %1.00 %0.70 %
   Synergy Health Radeberg2.00 %1.50 %1.50 %
   Synergy Health Allershausen2.20 %2.00 %1.75 %
              Harwell Dosimeters Ltd Retirement Benefits Scheme4.80 %2.85 %2.15 %
   Other post-retirement plan 3.25 %2.50 %3.00 %
Expected Return on Plan Assets:
   Synergy Health plc Retirement Benefits Scheme3.20 %3.60 %3.50 %
   Isotron BV Pension Plan1.80 %0.90 %1.60 %
   Synergy Health Daniken AG1.95 %1.00 %0.70 %
The net periodic benefit cost and the actuarial present value of projected benefit obligations are based upon assumptions that we review on an annual basis. These assumptions may be revised annually based upon an evaluation of long-term trends, as well as market conditions that may have an impact on the cost of providing benefits.
We develop our expected long-term rate of return on plan assets assumptions by evaluating input from third-party professional advisers, taking into consideration the asset allocation of the portfolios and the long-term asset class return expectations.
We develop our discount rate assumptions by evaluating input from third-party professional advisers, taking into consideration the current yield on country specific investment grade long-term bonds which provide for similar cash flow streams as our projected obligations.
We have made assumptions regarding healthcare costs in computing our other post-retirement benefit obligation. 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.
  
202320222021
Healthcare cost trend rate – medical7.50 %7.00 %7.00 %
Healthcare cost trend rate – prescription drug7.50 %7.00 %7.00 %
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.
Plan Assets. The investment policies for our plans are generally established by the local pension plan trustees and seek to maintain the plans' ability to meet liabilities and to comply with local minimum funding requirements. Plan assets are invested in diversified portfolios that provide adequate levels of return at an acceptable level of risk. The investment policies are reviewed at least annually and revised, as deemed appropriate to ensure that the objectives are being met. At March 31, 2023, the targeted allocation for the plans were approximately 75% equity investments and 25% fixed income investments.
Financial instruments included in pension plan assets are categorized into three tiers. These tiers include a fair value hierarchy of three levels, based on the degree of subjectivity inherent in the valuation methodology as follows:
Level 1 - Quoted prices for identical assets in active markets.
Level 2 - Quoted prices for similar assets in active markets with inputs that are observable, either directly or indirectly.
Level 3 - Unobservable prices or inputs in which little or no market data exists.
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)TotalQuoted
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 annuities10,285 — 10,285 — 
Insurance contracts5,387 — — 5,387 
Common and collective trusts valued at net asset value:
    Equity security trusts48,137 — — — 
    Debt security trusts42,942 — — — 
Total Plan Assets$107,089 $338 $10,285 $5,387 
 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 
Collective investment trusts are measured at fair value using the net asset value per share practical expedient. These trusts have not been categorized in the fair value hierarchy and are being presented in the tables above to permit a reconciliation of the fair value hierarchy to the total plan assets.
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 currency153 
Balance at March 31, 2022$5,383 
    Gains (losses) related to assets still held at year-end(157)
    Transfers out of Level 3320 
    Foreign currency(159)
Balance at March 31, 2023$5,387 
Cash Flows.  We contribute amounts to our defined benefit pension plans at least equal to the minimum amounts required by applicable employee benefit laws and local tax laws. We expect to make contributions of approximately $3,955 during fiscal 2024.
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 
20256,265 1,019 
20266,458 913 
20276,663 823 
20286,845 731 
2029 and thereafter37,315 2,620 
The Medicare Prescription Drug, Improvement and Modernization Act of 2003 (the “Act”) provides a prescription drug benefit for Medicare beneficiaries, a benefit we provide to Medicare eligible retirees covered by our post-retirement benefits plan. We have concluded that the prescription drug benefit provided in our post-retirement benefit plan is considered to be actuarially equivalent to the benefit provided under the Act and thus qualifies for the subsidy under the Act. Benefits are subject to a per capita per month cost cap and any costs above the cap become the responsibility of the retiree. Under the plan, the subsidy is applied to reduce the retiree responsibility. As a result, the expected future subsidy no longer reduces our accumulated post-retirement benefit obligation and net periodic benefit cost. We collected subsidies totaling approximately $477 and $660, during fiscal 2023 and fiscal 2022, respectively, which reduced the retiree responsibility for costs in excess of the caps established in the post-retirement benefit plan.
Defined Contribution Plans. We maintain 401(k) defined contribution plans for eligible U.S. employees, a 401(k) defined contribution plan for eligible Puerto Rico employees and similar savings plans for certain employees in Canada, United Kingdom, Ireland, and Finland. We provide a match on a specified portion of an employee’s contribution. The U.S. plan assets are held in trust and invested as directed by the plan participants. The Canadian plan assets are held by insurance companies. The aggregate fair value of the U.S. plan assets was $1,170,835 at March 31, 2023. At March 31, 2023, the U.S. plan held 483,931 STERIS ordinary shares with a fair value of $92,566. We paid dividends of $886, $852, and $839 to the plan and participants on STERIS shares held by the plan for the years ended March 31, 2023, 2022, and 2021, respectively. We contributed approximately $36,564, $38,600, and $29,853, to the defined contribution plans for the years ended March 31, 2023, 2022, and 2021, respectively.
We also maintain a domestic non-qualified deferred compensation plan covering certain employees, which formerly allowed for the deferral of compensation for an employee-specified term or until retirement or termination. There have been no employee contributions made to this plan since fiscal 2012. The Plan was amended in fiscal 2012 to disallow deferrals of salary payable in 2012 and subsequent calendar years and of commissions and other incentive compensation payable in respect of the 2013 and subsequent fiscal years. We hold investments in mutual funds to satisfy future obligations of the plan. We account for these assets as available-for-sale securities and they are included in “Other assets” on our accompanying Consolidated Balance Sheets, with a corresponding liability for the plan’s obligation recorded in Accrued expenses and other. The aggregate value of the assets was $938 and $1,061 at March 31, 2023 and March 31, 2022, respectively. Realized gains and losses on these investments are recorded in Interest income and miscellaneous expense (income) within Non-operating expenses, net on our accompanying Consolidated Statements of Income. Changes in the fair value of the assets are recorded in Accumulated other comprehensive income (loss) on our accompanying Balance Sheets.