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Investments (Table Text Block) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Mar. 31, 2023
Investments Debt Equity Securities [Abstract] |  |
Available for sale investments |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses More than 12 Months |  | Gross Unrealized Losses Less than 12 Months |  | Allowance for Expected Credit Losses |  | Fair Market Value
|  | (Unaudited)
|  | (In thousands)
U.S. treasury securities and government obligations | $ | 172,987 | $ | 335 | $ | (2,315) | $ | (116) | $ | – | $ | 170,891
U.S. government agency mortgage-backed securities |  | 99,230 |  | 1 |  | (3,703) |  | (5,009) |  | – |  | 90,519
Obligations of states and political subdivisions |  | 154,547 |  | 441 |  | (4,261) |  | (5,064) |  | – |  | 145,663
Corporate securities |  | 1,817,003 |  | 983 |  | (154,177) |  | (47,305) |  | (1,697) |  | 1,614,807
Mortgage-backed securities |  | 514,679 |  | 206 |  | (40,394) |  | (24,243) |  | – |  | 450,248
| $ | 2,758,446 | $ | 1,966 | $ | (204,850) | $ | (81,737) | $ | (1,697) | $ | 2,472,128
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses More than 12 Months |  | Gross Unrealized Losses Less than 12 Months |  | Allowance for Expected Credit Losses |  | Fair Market Value
|  | (In thousands)
U.S. treasury securities and government obligations | $ | 353,189 | $ | 3,061 | $ | (7,639) | $ | (3,935) | $ | – | $ | 344,676
U.S. government agency mortgage-backed securities |  | 34,126 |  | 40 |  | (6,707) |  | (228) |  | – |  | 27,231
Obligations of states and political subdivisions |  | 161,960 |  | 649 |  | (4,014) |  | (8,090) |  | – |  | 150,505
Corporate securities |  | 2,086,432 |  | 1,491 |  | (60,224) |  | (156,365) |  | (2,101) |  | 1,869,233
Mortgage-backed securities |  | 370,880 |  | 78 |  | (40,359) |  | (13,207) |  | – |  | 317,392
| $ | 3,006,587 | $ | 5,319 | $ | (118,943) | $ | (181,825) | $ | (2,101) | $ | 2,709,037
Adjusted Cost and Estimated Market Value of Available-for-sale Investments |
|  | September 30, 2023 |  | March 31, 2023
|  | Amortized Cost |  | Fair Market Value |  | Amortized Cost |  | Fair Market Value
|  | (Unaudited) |  |
|  | (In thousands)
Due in one year or less | $ | 251,106 | $ | 249,366 | $ | 354,875 | $ | 354,184
Due after one year through five years |  | 599,626 |  | 569,012 |  | 754,175 |  | 717,552
Due after five years through ten years |  | 659,400 |  | 590,567 |  | 736,089 |  | 665,708
Due after ten years |  | 733,486 |  | 612,788 |  | 790,568 |  | 654,201
|  | 2,243,618 |  | 2,021,733 |  | 2,635,707 |  | 2,391,645
Mortgage-backed securities |  | 514,828 |  | 450,395 |  | 370,880 |  | 317,392
| $ | 2,758,446 | $ | 2,472,128 | $ | 3,006,587 | $ | 2,709,037
Available for sale equity investments |
|  | September 30, 2023 |  | March 31, 2023
|  | Amortized Cost |  | Fair Market Value |  | Amortized Cost |  | Fair Market Value
|  | (Unaudited) |  |  |  |
|  | (In thousands)
Common stocks | $ | 29,602 | $ | 42,045 | $ | 29,577 | $ | 39,375
Non-redeemable preferred stocks |  | 25,144 |  | 19,991 |  | 26,054 |  | 21,982
| $ | 54,746 | $ | 62,036 | $ | 55,631 | $ | 61,357
Carrying value of Investments, other |
|  | September 30, |  | March 31,
|  | 2023 |  | 2023
|  | (Unaudited) |  |
|  | (In thousands)
Mortgage loans, net | $ | 550,913 | $ | 466,531
Short-term investments |  | – |  | 15,921
Real estate |  | 72,036 |  | 72,178
Policy loans |  | 10,986 |  | 10,921
Other equity investments |  | 16,216 |  | 9,989
| $ | 650,151 | $ | 575,540

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