Related Party Transations (Table Text Block)

9 Months Ended

Dec. 31, 2024

Dec. 31, 2023

Related Party Revenue [Abstract]

Related Party Revenue

	Quarter ended December 31,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul management fee revenue from Blackwater	$	7,193	$	7,135
U-Haul management fee revenue from Mercury		1,676		3,003
	$	8,869	$	10,138

	Nine months ended December 31,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul management fee revenue from Blackwater	$	22,713	$	22,585
U-Haul management fee revenue from Mercury		5,237		5,997
	$	27,950	$	28,582

	Quarter ended December 31,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul management fee revenue from Blackwater	$	7,193	$	7,135
U-Haul management fee revenue from Mercury		1,676		3,003
	$	8,869	$	10,138

	Nine months ended December 31,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul management fee revenue from Blackwater	$	22,713	$	22,585
U-Haul management fee revenue from Mercury		5,237		5,997
	$	27,950	$	28,582

Related Party costs and expenses

	Quarter ended December 31,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul lease expenses to Blackwater	$	604	$	604
U-Haul printing expenses to Blackwater		1,176		877
U-Haul commission expenses to Blackwater		19,409		18,946
U-Haul lease expenses to Mercury		38		—
U-Haul commission expenses to Mercury		5,304		—
	$	26,531	$	20,427

	Nine months ended December 31,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul lease expenses to Blackwater	$	1,812	$	1,812
U-Haul printing expenses to Blackwater		3,734		2,194
U-Haul commission expenses to Blackwater		66,538		65,684
U-Haul lease expenses to Mercury		114		—
U-Haul commission expenses to Mercury		17,755		—
	$	89,953	$	69,690

	Quarter ended December 31,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul lease expenses to Blackwater	$	604	$	604
U-Haul printing expenses to Blackwater		1,176		877
U-Haul commission expenses to Blackwater		19,409		18,946
U-Haul lease expenses to Mercury		38		—
U-Haul commission expenses to Mercury		5,304		—
	$	26,531	$	20,427

	Nine months ended December 31,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul lease expenses to Blackwater	$	1,812	$	1,812
U-Haul printing expenses to Blackwater		3,734		2,194
U-Haul commission expenses to Blackwater		66,538		65,684
U-Haul lease expenses to Mercury		114		—
U-Haul commission expenses to Mercury		17,755		—
	$	89,953	$	69,690

Related party assets

	December 31,			March 31,
	2024			2024
	(Unaudited)
	(In thousands)
U-Haul receivable from Blackwater	$	40,323		$	31,950
U-Haul receivable from Mercury		18,604			24,536
Other (a)		(879	)		1,448
	$	58,048		$	57,934

(a)Timing differences for intercompany receivables and payables with insurance subsidiaries resulting from the three-month difference in reporting periods.