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Inventories (Narratives) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |
Increase (Decrease) in Inventories | $ (15,752) | $ 15,411 | $ 12,249
LIFO liquidations | 2,805 | 109 |
Net inventories | $ 127,373 | $ 146,263 |

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