Allowance for Credit Losses (Table Text Block)	12 Months Ended
	Mar. 31, 2022
Allowance For Credit Loss [Abstract]
Accounts Receivable Allowance For Credit Loss [Table Text Block]	Allowance for Credit Losses     Trade Receivables   Investments, Fixed Maturities   Investments, other   Total                       (In thousands)     Balance as of March 31, 2020 $ 3,215 $ 503 $ 501 $ 4,219 Transition adjustment current expected credit losses   1,206   817   –   2,023 Write-offs against allowance   –   –   –   – Recoveries   –   –   –   – Balance as of March 31, 2021 $ 4,421 $ 1,320 $ 501 $ 6,242 Provision for (reversal of) credit losses   4,228   (1,260)   –   2,968 Write-offs against allowance   –   –   –   – Recoveries   –   –   –   – Balance as of March 31, 2022$ 8,649 $ 60 $ 501 $ 9,210