Related Party Transations (Table Text Block)

3 Months Ended

6 Months Ended

12 Months Ended

Sep. 30, 2024

Sep. 30, 2024

Mar. 31, 2024

Related Party Revenue [Abstract]

Related Party Revenue

	Quarter ended September 30,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul management fee revenue from Blackwater	$	7,805	$	7,754
U-Haul management fee revenue from Mercury		1,781		1,513
	$	9,586	$	9,267

	Six months ended September 30,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul management fee revenue from Blackwater	$	15,520	$	15,450
U-Haul management fee revenue from Mercury		3,561		2,994
	$	19,081	$	18,444

Related Party costs and expenses

	Quarter ended September 30,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul lease expenses to Blackwater	$	604	$	604
U-Haul printing expenses to Blackwater		1,455		968
U-Haul commission expenses to Blackwater		24,434		24,035
U-Haul lease expenses to Mercury		38		—
U-Haul commission expenses to Mercury		6,323		—
	$	32,854	$	25,607

	Six months ended September 30,
	2024		2023
	(Unaudited)
	(In thousands)
U-Haul lease expenses to Blackwater	$	1,208	$	1,208
U-Haul printing expenses to Blackwater		2,558		1,317
U-Haul commission expenses to Blackwater		47,129		46,738
U-Haul lease expenses to Mercury		76		—
U-Haul commission expenses to Mercury		12,451		—
	$	63,422	$	49,263

Related party assets

	September 30,			March 31,
	2024			2024
	(Unaudited)
	(In thousands)
U-Haul receivable from Blackwater	$	40,135		$	31,950
U-Haul receivable from Mercury		22,525			24,536
Other (a)		(8,372	)		1,448
	$	54,288		$	57,934

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

	September 30,			March 31,
	2024			2024
	(Unaudited)
	(In thousands)
U-Haul receivable from Blackwater	$	40,135		$	31,950
U-Haul receivable from Mercury		22,525			24,536
Other (a)		(8,372	)		1,448
	$	54,288		$	57,934

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