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Description of Business (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Revenue from External Customer [Line Items] |  |  |  |
Operating Income (Loss) | $ 20,886,000 | $ 6,646,000 | $ 73,160,000 | $ 44,974,000
Revenue from Contract with Customer Benchmark [Member] | UNITED STATES |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales revenue goods net percentage | 54.00% |  | 55.00% |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Operating Income (Loss) |  | $ 990,000 |  | $ 3,106,000

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