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Description of Business (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Revenue from External Customer [Line Items] |  |  |  |
Operating Income (Loss) | $ 10,447 | $ 20,886 | $ 28,056 | $ 73,160
Revenue from Contract with Customer Benchmark [Member] | UNITED STATES |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales revenue goods net percentage | 53.00% |  | 53.00% |

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