Benefit Plans (Assumptions used in calculating benefit obligations and net periodic benefit cost) (Details)
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12 Months Ended |
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2018 |
| Synergy Health PLC Plan [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |
2.40%
|
2.50%
|
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| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets |
4.80%
|
5.02%
|
4.97%
|
| Isotron [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |
1.60%
|
1.20%
|
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| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets |
1.20%
|
1.60%
|
1.60%
|
| Daniken [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |
0.20%
|
0.85%
|
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| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets |
0.65%
|
1.20%
|
1.40%
|
| Radeberg [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |
1.60%
|
1.60%
|
|
| Allershausen [Member] |
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|
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |
0.50%
|
1.60%
|
|
| Harwell Dosimeters [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |
2.45%
|
2.35%
|
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| Other Pension Plans, Defined Benefit [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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|
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| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |
3.00%
|
3.50%
|
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