Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Comprehensive income (loss) (pretax):
Net earnings, Pre-tax	$ 51,580	$ 89,417	$ 270,760	$ 592,026
Comprehensive income (loss) (tax effect):
Net earnings, Tax	(14,612)	(22,251)	(59,847)	(142,645)
Comprehensive income (loss) (net of tax):
Net earnings available to common stockholders	36,968	67,166	210,913	449,381
Other comprehensive income (loss):
Foreign currency translation, Pre-tax	1,841	3,929	2,802	3,712
Foreign currency translation, Net	1,841	3,929	2,802	3,712
Unrealized net loss on investments and future policy benefits discount rate remeasurement gains (losses), Pre-tax	25,393	68,650	75,331	57,171
Unrealized net loss on investments and future policy benefits discount rate remeasurement gains (losses), Tax	(5,367)	(14,542)	(15,871)	(12,508)
Unrealized net loss on investments and future policy benefits discount rate remeasurement gains (losses), Tax	20,026	54,108	59,460	44,663
Change in fair value of cash flow hedges, Pre-tax	610	6,121	5,299	5,907
Change in fair value of cash flow hedges, Tax	153	1,510	1,319	1,505
Change in fair value of cash flow hedges, net	457	4,611	3,980	4,402
Amounts reclassified into earnings on hedging activities, Pre-tax	813	1,596	3,923	12,500
Amounts reclassified into earnings on hedging activities, Tax	203	399	981	3,125
Amounts reclassified into earnings on hedging activities, Net	610	1,197	2,942	9,375
Other Comprehensive Income (Loss), Pre-tax	27,031	69,246	76,757	46,866
Other comprehensive income (loss) Tax	(5,317)	(15,653)	(15,533)	(10,888)
Other comprehensive income (loss) Net	21,714	53,593	61,224	35,978
Total comprehensive income (loss) (Pre-tax)	24,549	158,663	347,517	638,892
Total comprehensive income (loss) (Tax)	9,295	37,904	75,380	153,533
Comprehensive income (loss) Net	$ 15,254	$ 120,759	$ 272,137	$ 485,359