Net Investment and Interest Income (Table Text Block)	12 Months Ended
	Mar. 31, 2022
Table Text Block [Abstract]
Net Investment and Interest Income	Years Ended March 31,     2022   2021   2020     (In thousands) Fixed maturities $ 111,625 $ 102,021 $ 107,434 Real estate   5,648   5,769   7,304 Insurance policy loans   705   829   974 Mortgage loans   25,850   18,248   17,164 Short-term, amounts held by ceding reinsurers, net and other investments   11,713   3,103   9,807 Investment income   155,541   129,970   142,683 Less: investment expenses   (7,280)   (7,032)   (4,854) Net investment and interest income$ 148,261 $ 122,938 $ 137,829