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