Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Comprehensive income (loss) (pretax):
Net earnings, Pre-tax	$ 89,417	$ 129,773	$ 592,026	$ 826,516
Comprehensive income (loss) (tax effect):
Net earnings, Tax	(22,251)	(30,549)	(142,645)	(196,946)
Comprehensive income (loss) (net of tax):
Earnings available to common stockholders	67,166	99,224	449,381	629,570
Other comprehensive income (loss):
Foreign currency translation, Pre-tax	3,929	5,268	3,712	2,888
Foreign currency translation, Net	3,929	5,268	3,712	2,888
Unrealized net loss on investments and future policy benefits discount rate remeasurement gains (losses), Pre-tax	68,650	41,618	57,171	32,942
Unrealized net loss on investments and future policy benefits discount rate remeasurement gains (losses), Tax	(14,542)	(8,833)	(12,508)	(7,204)
Unrealized net loss on investments and future policy benefits discount rate remeasurement gains (losses), Tax	54,108	32,785	44,663	25,738
Change in fair value of cash flow hedges, Pre-tax	6,121	5,769	5,907	3,742
Change in fair value of cash flow hedges, Tax	(1,510)	(1,417)	(1,505)	(919)
Change in fair value of cash flow hedges, Net	4,611	4,352	4,402	2,823
Amounts reclassified into earnings on hedging activities, Pre-tax	1,596	1,471	12,500	3,966
Amounts reclassified into earnings on hedging activities, Tax	(399)	(362)	(3,125)	(974)
Amounts reclassified into earnings on hedging activities, Net	1,197	1,109	9,375	2,992
Other Comprehensive Income (Loss), Pre-tax	69,246	43,590	46,866	30,278
Other comprehensive income (loss) Tax	(15,653)	(10,612)	(10,888)	(7,259)
Other comprehensive income (loss) Net	53,593	32,978	35,978	23,019
Comprehensive income (loss) Pre-tax	158,663	86,183	638,892	796,238
Comprehensive income (loss) Tax	(37,904)	(19,937)	(153,533)	(189,687)
Comprehensive income (loss) Net	$ 120,759	$ 66,246	$ 485,359	$ 606,551