Accumulated Other Comprehensive Loss (Table Text Block)

9 Months Ended

Dec. 31, 2024

Dec. 31, 2023

Table Text Block Supplement [Abstract]

Summary of Accumulated Other Comprehensive Income (Loss) Components, Net of Tax

	Foreign Currency Translation			Unrealized Net Gains (Losses) on Investments and Impact of LFPB Discount Rates (a)			Fair Value of Cash Flow Hedges			Postretirement Benefit Obligation Net Loss		Accumulated Other Comprehensive Loss
	(Unaudited)
	(In thousands)
Balance as of September 30, 2024	$	(53,490	)	$	(186,328	)	$	(2,057	)	$	1,044	$	(240,831	)
Foreign currency translation		(3,929	)		—			—			—		(3,929	)
Unrealized net gain on investments and future policy benefits discount rate remeasurement gains (losses)		—			54,108			—			—		54,108
Change in fair value of cash flow hedges		—			—			4,611			—		4,611
Amounts reclassified into earnings on hedging activities		—			—			(1,197	)		—		(1,197	)
Other comprehensive income (loss)		(3,929	)		54,108			3,414			—		53,593
Balance as of December 31, 2024	$	(57,419	)	$	(132,220	)	$	1,357		$	1,044	$	(187,238	)

	Foreign Currency Translation			Unrealized Net Gains (Losses) on Investments and Impact of LFPB Discount Rates (a)			Fair Value of Cash Flow Hedges			Postretirement Benefit Obligation Net Loss		Accumulated Other Comprehensive Loss
	(Unaudited)
	(In thousands)
Balance as of March 31, 2024	$	(53,707	)	$	(176,883	)	$	6,330		$	1,044	$	(223,216	)
Foreign currency translation		(3,712	)		—			—			—		(3,712	)
Unrealized net gain on investments and future policy benefits discount rate remeasurement gains (losses)		—			44,663			—			—		44,663
Change in fair value of cash flow hedges		—			—			4,402			—		4,402
Amounts reclassified into earnings on hedging activities		—			—			(9,375	)		—		(9,375	)
Other comprehensive income (loss)		(3,712	)		44,663			(4,973	)		—		35,978
Balance as of December 31, 2024	$	(57,419	)	$	(132,220	)	$	1,357		$	1,044	$	(187,238	)

	Foreign Currency Translation			Unrealized Net Gains (Losses) on Investments and Impact of LFPB Discount Rates (a)			Fair Value of Cash Flow Hedges			Postretirement Benefit Obligation Net Loss			Accumulated Other Comprehensive Loss
	(Unaudited)
	(In thousands)
Balance as of September 30, 2023	$	(58,919	)	$	(225,693	)	$	9,299		$	(351	)	$	(275,664	)
Foreign currency translation		5,268			—			—			—			5,268
Unrealized net loss on investments and future policy benefits discount rate remeasurement gains (losses)		—			(32,785	)		—			—			(32,785	)
Change in fair value of cash flow hedges		—			—			(4,352	)		—			(4,352	)
Amounts reclassified into earnings on hedging activities		—			—			(1,109	)		—			(1,109	)
Other comprehensive income (loss)		5,268			(32,785	)		(5,461	)		—			(32,978	)
Balance as of December 31, 2023	$	(53,651	)	$	(258,478	)	$	3,838		$	(351	)	$	(308,642	)

	Foreign Currency Translation			Unrealized Net Gains (Losses) on Investments and Impact of LFPB Discount Rates (a)			Fair Value of Cash Flow Hedges			Postretirement Benefit Obligation Net Loss			Accumulated Other Comprehensive Loss
	(Unaudited)
	(In thousands)
Balance as of March 31, 2023	$	(56,539	)	$	(232,740	)	$	4,007		$	(351	)	$	(285,623	)
Foreign currency translation		2,888			—			—			—			2,888
Unrealized net loss on investments and future policy benefits discount rate remeasurement gains (losses)		—			(25,738	)		—			—			(25,738	)
Change in fair value of cash flow hedges		—			—			2,823			—			2,823
Amounts reclassified into earnings on hedging activities		—			—			(2,992	)		—			(2,992	)
Other comprehensive income (loss)		2,888			(25,738	)		(169	)		—			(23,019	)
Balance as of December 31, 2023	$	(53,651	)	$	(258,478	)	$	3,838		$	(351	)	$	(308,642	)