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Executive Stock Plans And Stock-Based Compensation (Stock-Based Compensation Expense And Related Income Tax Benefit Recognized) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Share-based Payment Arrangement, Additional Disclosure [Abstract] |  |  |
Total stock-based compensation expense | $ 6,106 | $ 5,631 | $ 8,152
Income tax benefit recorded on stock-based compensation expense | $ 1,282 | $ 1,182 | $ 1,712

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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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