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Inventories (Narratives) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Business Acquisition [Line Items] |  |  |
Increase (Decrease) in Inventories | $ (20,659) | $ (15,752) | $ 15,411
LIFO liquidations | 1,640 | 2,805 |
Net inventories | $ 111,488 | $ 127,373 |

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- Definition The effect of liquidating LIFO (last in first out) inventory layers on income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SAB Topic 11.F) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729 + Details
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