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Benefit Plans (Tables)
 12 Months Ended
Mar. 31, 2019
Notes To Financial Statements [Abstract]  
Schedule of Expected Benefit Payments
Based upon the actuarial assumptions utilized to develop our benefit obligations at March 31, 2019, the following benefit payments are expected to be made to plan participants:
  
 
Other Defined Benefit Pension Plans
 
Other Post-Retirement Benefits Plan
2020
 
$
5,613

 
$
1,633

2021
 
5,767

 
1,499

2022
 
5,928

 
1,394

2023
 
6,441

 
1,261

2024
 
6,254

 
1,139

2025-2030
 
34,102

 
4,244
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) During fiscal 2020, we will amortize the following pre-tax amounts from accumulated other comprehensive income:
  
 
 Defined Benefit Pension Plans
 
Other Post-Retirement
Benefits Plan
Actuarial loss
 
$
8

 
$
552

Prior Service Cost
 
71

 
(3,263
)
Schedule of Accrued Liabilities
Amounts recognized in the consolidated balance sheets consist of the following:
 
 
Other Defined Benefit Pension Plans
 
Other Post-Retirement Benefits Plan
  
 
2019
 
2018
 
2019
 
2018
Current liabilities
 
$
—

 
$
—

 
$
(1,633
)
 
$
(1,906
)
Noncurrent liabilities
 
(16,168
)
 
(29,407
)
 
(10,918
)
 
(12,194
)
 
 
$
(16,168
)
 
$
(29,407
)
 
$
(12,551
)
 
$
(14,100
)
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, 2019 and 2018:
 
 
Other Defined Benefit Pension Plans
  
 
2019
 
2018
Aggregate fair value of plan assets
 
$
117,504

 
$
119,441

Aggregate accumulated benefit obligations
 
130,669

 
148,848

Aggregate projected benefit obligations
 
133,672

 
148,848
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:
 
 
Other Defined Benefit Pension Plans
 
Other Post-Retirement Benefits Plan
  
 
2019
 
2018
 
2017
 
2019
 
2018
 
2017
Service cost
 
$
2,394

 
$
2,402

 
$
1,650

 
$
—

 
$
—

 
$
—

Interest cost
 
3,139

 
3,262

 
3,434

 
457

 
519

 
554

Expected return on plan assets
 
(4,930
)
 
(4,835
)
 
(2,853
)
 

 
—

 
—

Prior service cost recognition
 
51

 
—

 
—

 
(3,263
)
 
(3,263
)
 
(3,263
)
Net amortization and deferral
 
474

 
126

 
—

 
552

 
648

 
739

Net periodic benefit cost
 
$
1,128

 
$
955

 
$
2,231

 
$
(2,254
)
 
$
(2,096
)
 
$
(1,970
)
Recognized in other comprehensive loss (income) before tax:
 
 
 
 
 
 
 
 
 
 
 
 
Net loss (gain) occurring during year
 
$
(6,545
)
 
$
(697
)
 
$
(7,553
)
 
$
106

 
$
501

 
$
531

Amortization of prior service credit
 
781

 
—

 
—

 
3,263

 
3,263

 
3,263

Amortization of net loss
 
(468
)
 
(126
)
 
—

 
(552
)
 
(648
)
 
(739
)
Total recognized in other comprehensive loss (income)
 
(6,232
)
 
(823
)
 
(7,553
)
 
2,817

 
3,116

 
3,055

Total recognized in total benefits cost and other comprehensive loss (income)
 
$
(5,104
)
 
$
132

 
$
(5,322
)
 
$
563

 
$
1,020

 
$
1,085
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:
  
 
2019
 
2018
 
2017
Discount Rate:
 
 
 
 
 
 
   Synergy Health plc Retirement Benefits Scheme
 
2.50
%
 
2.60
%
 
3.50
%
   Isotron BV Pension Plan
 
1.60
%
 
1.60
%
 
1.60
%
   Synergy Health Daniken AG
 
0.95
%
 
0.65
%
 
0.65
%
   Synergy Health Radeberg
 
1.60
%
 
1.50
%
 
1.50
%
   Synergy Health Allershausen
 
1.60
%
 
1.50
%
 
1.50
%
             Harwell Dosimeters Ltd Retirement Benefits Scheme
 
2.55
%
 
2.55
%
 
n/a

Other post-retirement plan
 
3.50
%
 
3.50
%
 
3.50
%
Expected Return on Plan Assets:
 
 
 
 
 
 
   Synergy Health plc Retirement Benefits Scheme
 
5.02
%
 
4.97
%
 
4.87
%
   Isotron BV Pension Plan
 
1.60
%
 
1.60
%
 
1.60
%
   Synergy Health Daniken AG
 
1.20
%
 
1.40
%
 
1.40
%
Schedule of Assumptions Used The following table presents significant assumptions used to determine the projected benefit obligations at March 31:
  
 
2019
 
2018
Discount Rate:
 
 
 
 
   Synergy Health plc Retirement Benefits Scheme
 
2.50
%
 
2.50
%
   Isotron BV Pension Plan
 
1.20
%
 
1.60
%
   Synergy Health Daniken AG
 
0.85
%
 
0.95
%
   Synergy Health Radeberg
 
1.60
%
 
1.60
%
   Synergy Health Allershausen
 
1.60
%
 
1.60
%
   Harwell Dosimeters Ltd Retirement Benefits Scheme
 
2.35
%
 
2.55
%
   Other post-retirement plan
 
3.50
%
 
3.50
%
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.
  
 
2019
 
2018
 
2017
Healthcare cost trend rate – medical
 
6.8
%
 
7.0
%
 
7.0
%
Healthcare cost trend rate – prescription drug
 
6.8
%
 
7.0
%
 
7.0
%
Long-term healthcare cost trend rate
 
4.5
%
 
4.5
%
 
4.5
%
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.
A one-percentage-point change in assumed healthcare cost trend rates (including medical, prescription drug, and long-term rates) would have had the following effect on our other post-retirement benefit obligation at March 31, 2019:
 
 
One-Percentage Point
  
 
Increase
 
Decrease
Effect on total service and interest cost components
 
$
—

 
$
—

Effect on other post-retirement benefit obligation
 
11

 
(11
)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The fair value of our pension benefits plan assets at March 31, 2019 and 2018 by asset category is as follows:
 
 
Fair Value Measurements at March 31, 2019
(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
 
$
450

 
$
450

 
$
—

 
$
—

Insured annuities
 
14,720

 
—

 
14,720

 
—

Insurance contracts
 
5,089

 
—

 
—

 
5,089

Common and collective trusts valued at net asset value:
 
 
 
 
 
 
 
 
    Equity security trusts
 
73,532

 
—

 
—

 
—

    Debt security trusts
 
23,713

 
—

 
—

 
—

Total Plan Assets
 
$
117,504

 
$
450

 
$
14,720

 
$
5,089


 
 
Fair Value Measurements at March 31, 2018
(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
 
$
67

 
$
67

 
$
—

 
$
—

Insured annuities
 
15,228

 
—

 
15,228

 
—

Insurance contracts
 
5,484

 
—

 
—

 
5,484

Common and collective trusts valued at net asset value:
 
 
 
 
 
 
 
 
    Equity security trusts
 
74,081

 
—

 
—

 
—

    Debt security trusts
 
24,581

 
—

 
—

 
—

Total Plan Assets
 
$
119,441

 
$
67

 
$
15,228

 
$
5,484
Schedule of Defined Benefit Plans Disclosures
 
Other Defined Benefit Pension Plans
 
Other
Post-Retirement
Benefits Plan
 
2019
 
2018
 
2019
 
2018
Change in Benefit Obligations:
 
 
 
 
 
 
 
Benefit Obligations at Beginning of Year
$
148,848

 
$
128,897

 
$
14,100

 
$
16,008

Obligation assumed in business acquisition
—

 
3,843

 
—

 
—

Service cost
2,394

 
2,402

 
—

 
—

Prior service cost
831

 
—

 
—

 
—

Interest cost
3,255

 
3,262

 
457

 
519

Actuarial loss (gain)
(4,402
)
 
(697
)
 
(106
)
 
(501
)
Benefits and expenses
(6,150
)
 
(6,075
)
 
(1,900
)
 
(1,926
)
Employee contributions
743

 
765

 
—

 
—

Impact of foreign currency exchange rate changes
(11,847
)
 
16,451

 
—

 
—

Benefit Obligations at End of Year
133,672

 
148,848

 
12,551

 
14,100

Change in Plan Assets:
 
 
 
 
 
 
 
Fair Value of Plan Assets at Beginning of Year
119,441

 
101,663

 
—

 
—

Assets assumed in business acquisition
—

 
4,462

 
—

 
—

Actual return on plan assets
6,543

 
1,052

 
—

 
—

Employer contributions
5,005

 
5,150

 
1,900

 
1,926

Employee contributions
742

 
765

 
—

 
—

Benefits and expenses paid
(6,150
)
 
(6,078
)
 
(1,900
)
 
(1,926
)
Impact of foreign currency exchange rate changes
(8,077
)
 
12,427

 
—

 
—

Fair Value of Plan Assets at End of Year
117,504

 
119,441

 
—

 
—

Funded Status of the Plans
$
(16,168
)
 
$
(29,407
)
 
$
(12,551
)
 
$
(14,100
)
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 2019 due to the following:
 
 
Insurance contracts
Balance at March 31, 2017
 
$
3,959

    Gains (losses) related to assets still held at year-end
 
(43
)
    Additions from business acquisition
 
2,231

    Transfers out of Level 3
 
(852
)
    Foreign currency
 
189

Balance at March 31, 2018
 
$
5,484

    Gains (losses) related to assets still held at year-end
 
29

    Transfers out of Level 3
 
(132
)
    Foreign currency
 
(292
)
Balance at March 31, 2019
 
$
5,089