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Employee Benefit Plans (Defined Contribution Plans Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Share-based Payment Arrangement [Abstract] |  |  |
Expense for defined contribution plans | $ 10.6 | $ 8.6 | $ 8.7

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Period Type: | duration

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- References No definition available. + Details
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