Net Investment and Interest Income (Table Text Block)	12 Months Ended
	Mar. 31, 2023
Table Text Block [Abstract]
Net Investment and Interest Income	Years Ended March 31,     2023   2022   2021     (In thousands) Fixed maturities $ 171,814 $ 111,625 $ 102,021 Real estate   5,734   5,648   5,769 Insurance policy loans   869   705   829 Mortgage loans   23,854   25,850   18,248 Short-term, amounts held by ceding reinsurers, net and other investments   (17,257)   11,713   3,103 Investment income   185,014   155,541   129,970 Less: investment expenses   (8,335)   (7,280)   (7,032) Net investment and interest income$ 176,679 $ 148,261 $ 122,938