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Restructuring Costs (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Goodwill Impairment | $ 0 | $ 889 |
Restructuring and impairment costs | 7,543 | 20,304 | $ 0
Africa |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination benefits | 1,800 |  |
Impairment of Long-Lived Assets Held-for-use | 1,300 |  |
NORTH CAROLINA |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination benefits | $ 3,400 |  |
Non-US [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and impairment costs |  | 900 |
Tanzania |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination benefits |  | 4,000 |
Impairment of Long-Lived Assets Held-for-use |  | 14,600 |
Goodwill Impairment |  | $ 900 |

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