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Allowance for Credit Losses (Reserve Allowance Various Credit Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2020 | $ 6,242 | $ 4,219
Transition adjustment expected credit loss current | 2,968 | 2,023
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2021 | 9,210 | 6,242
Trade Receivables |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2020 | 4,421 | 3,215
Transition adjustment expected credit loss current | 4,228 | 1,206
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2021 | 8,649 | 4,421
Investments, Fixed Maturities |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2020 | 1,320 | 503
Transition adjustment expected credit loss current | (1,260) | 817
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2021 | 60 | 1,320
Investments, Other |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2020 | 501 | 501
Transition adjustment expected credit loss current | 0 | 0
Write-offs against allowance | 0 | 0
Recoveries | 0 | 0
March 31, 2021 | $ 501 | $ 501

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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