Consolidated Statement of Operations by Industry Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Revenues:
Self-moving equipment rentals	$ 580,708		$ 521,649
Self-storage revenues	49,134		42,099
Self-moving and self-storage products and service sales	74,479		70,691
Property management fees	5,677		5,161
Life insurance premiums	37,930		41,062
Property and casualty insurance premiums	9,618		7,966
Net investment and interest income	21,046		18,989
Other revenue	45,596		41,340
Total revenues	824,188		748,957
Costs and expenses:
Operating expenses	355,207		311,627
Commission expenses	79,665		68,627
Cost of sales	41,628		35,570
Benefits and losses	40,784		42,633
Amortization of deferred policy acquisition costs	4,184		3,683
Lease expense	22,470		27,007
Depreciation, net of (gains) losses on disposals	61,051		57,434
Total costs and expenses	604,989		546,581
Earnings (loss) from operations before equity in earnings of subsidiaries	219,199		202,376
Equity in earnings of subsidiaries	0		0
Earnings from operations	219,199		202,376
Interest income (expense)	(24,148)		(23,328)
Pretax earnings	195,051		179,048
Income tax expense	(70,577)		(66,080)
Earnings available to common shareholders	124,474		112,968
Operating Segments [Member] | Moving and Storage Consolidations [Member]
Revenues:
Self-moving equipment rentals	581,400		522,083
Self-storage revenues	49,134		42,099
Self-moving and self-storage products and service sales	74,479		70,691
Property management fees	5,677		5,161
Life insurance premiums	0		0
Property and casualty insurance premiums	0		0
Net investment and interest income	4,477		3,409
Other revenue	44,987		40,960
Total revenues	760,154		684,403
Costs and expenses:
Operating expenses	344,539		301,711
Commission expenses	79,665		68,627
Cost of sales	41,628		35,570
Benefits and losses	0		0
Amortization of deferred policy acquisition costs	0		0
Lease expense	22,514		27,053
Depreciation, net of (gains) losses on disposals	61,051		57,434
Total costs and expenses	549,397		490,395
Earnings (loss) from operations before equity in earnings of subsidiaries	210,757		194,008
Equity in earnings of subsidiaries	5,594		5,508
Earnings from operations	216,351		199,516
Interest income (expense)	(24,303)		(23,410)
Pretax earnings	192,048		176,106
Income tax expense	(67,574)		(63,138)
Earnings available to common shareholders	124,474		112,968
Operating Segments [Member] | Property and Casualty Insurance [Member]
Revenues:
Self-moving equipment rentals	0	[1]	0	[1]
Self-storage revenues	0	[1]	0	[1]
Self-moving and self-storage products and service sales	0	[1]	0	[1]
Property management fees	0	[1]	0	[1]
Life insurance premiums	0	[1]	0	[1]
Property and casualty insurance premiums	9,618	[1]	7,966	[1]
Net investment and interest income	2,794	[1]	2,477	[1]
Other revenue	0	[1]	0	[1]
Total revenues	12,412	[1]	10,443	[1]
Costs and expenses:
Operating expenses	5,801	[1]	4,096	[1]
Commission expenses	0	[1]	0	[1]
Cost of sales	0	[1]	0	[1]
Benefits and losses	2,589	[1]	1,957	[1]
Amortization of deferred policy acquisition costs	0	[1]	0	[1]
Lease expense	0	[1]	0	[1]
Depreciation, net of (gains) losses on disposals	0	[1]	0	[1]
Total costs and expenses	8,390	[1]	6,053	[1]
Earnings (loss) from operations before equity in earnings of subsidiaries	4,022	[1]	4,390	[1]
Equity in earnings of subsidiaries	0	[1]	0	[1]
Earnings from operations	4,022	[1]	4,390	[1]
Interest income (expense)	0		0	[1]
Pretax earnings	4,022	[1]	4,390	[1]
Income tax expense	(1,408)	[1]	(1,537)	[1]
Earnings available to common shareholders	2,614	[1]	2,853	[1]
Operating Segments [Member] | Life Insurance [Member]
Revenues:
Self-moving equipment rentals	0	[1]	0	[1]
Self-storage revenues	0	[1]	0	[1]
Self-moving and self-storage products and service sales	0	[1]	0	[1]
Property management fees	0	[1]	0	[1]
Life insurance premiums	37,930	[1]	41,062	[1]
Property and casualty insurance premiums	0	[1]	0	[1]
Net investment and interest income	13,965	[1]	13,222	[1]
Other revenue	725	[1]	495	[1]
Total revenues	52,620	[1]	54,779	[1]
Costs and expenses:
Operating expenses	5,666	[1]	6,360	[1]
Commission expenses	0	[1]	0	[1]
Cost of sales	0	[1]	0	[1]
Benefits and losses	38,195	[1]	40,676	[1]
Amortization of deferred policy acquisition costs	4,184	[1]	3,683	[1]
Lease expense	0	[1]	0	[1]
Depreciation, net of (gains) losses on disposals	0	[1]	0	[1]
Total costs and expenses	48,045	[1]	50,719	[1]
Earnings (loss) from operations before equity in earnings of subsidiaries	4,575	[1]	4,060	[1]
Equity in earnings of subsidiaries	0	[1]	0	[1]
Earnings from operations	4,575	[1]	4,060	[1]
Interest income (expense)	0	[1]	0	[1]
Pretax earnings	4,575	[1]	4,060	[1]
Income tax expense	(1,595)	[1]	(1,405)	[1]
Earnings available to common shareholders	2,980	[1]	2,655	[1]
Operating Segments [Member] | AMERCO [Member] | Moving and Storage Consolidations [Member]
Revenues:
Self-moving equipment rentals	0		0
Self-storage revenues	0		0
Self-moving and self-storage products and service sales	0		0
Property management fees	0		0
Life insurance premiums	0		0
Property and casualty insurance premiums	0		0
Net investment and interest income	1,239		1,238
Other revenue	0		0
Total revenues	1,239		1,238
Costs and expenses:
Operating expenses	1,938		2,221
Commission expenses	0		0
Cost of sales	0		0
Benefits and losses	0		0
Amortization of deferred policy acquisition costs	0		0
Lease expense	22		23
Depreciation, net of (gains) losses on disposals	1		1
Total costs and expenses	1,961		2,245
Earnings (loss) from operations before equity in earnings of subsidiaries	(722)		(1,007)
Equity in earnings of subsidiaries	111,308		99,795
Earnings from operations	110,586		98,788
Interest income (expense)	21,620		21,932
Pretax earnings	132,206		120,720
Income tax expense	(7,732)		(7,752)
Earnings available to common shareholders	124,474		112,968
Operating Segments [Member] | Uhaul [Member] | Moving and Storage Consolidations [Member]
Revenues:
Self-moving equipment rentals	581,400		522,083
Self-storage revenues	48,851		41,822
Self-moving and self-storage products and service sales	74,479		70,691
Property management fees	5,677		5,161
Life insurance premiums	0		0
Property and casualty insurance premiums	0		0
Net investment and interest income	1,957		2,170
Other revenue	46,629		42,530
Total revenues	758,993		684,457
Costs and expenses:
Operating expenses	368,524		323,007
Commission expenses	79,665		68,627
Cost of sales	41,628		35,570
Benefits and losses	0		0
Amortization of deferred policy acquisition costs	0		0
Lease expense	22,476		26,998
Depreciation, net of (gains) losses on disposals	56,010		54,166
Total costs and expenses	568,303		508,368
Earnings (loss) from operations before equity in earnings of subsidiaries	190,690		176,089
Equity in earnings of subsidiaries	0		0
Earnings from operations	190,690		176,089
Interest income (expense)	(26,899)		(30,044)
Pretax earnings	163,791		146,045
Income tax expense	(59,169)		(53,996)
Earnings available to common shareholders	104,622		92,049
Operating Segments [Member] | Real Estate [Member] | Moving and Storage Consolidations [Member]
Revenues:
Self-moving equipment rentals	0		0
Self-storage revenues	283		277
Self-moving and self-storage products and service sales	0		0
Property management fees	0		0
Life insurance premiums	0		0
Property and casualty insurance premiums	0		0
Net investment and interest income	1,281		1
Other revenue	27,888		24,569
Total revenues	29,452		24,847
Costs and expenses:
Operating expenses	3,607		2,622
Commission expenses	0		0
Cost of sales	0		0
Benefits and losses	0		0
Amortization of deferred policy acquisition costs	0		0
Lease expense	16		32
Depreciation, net of (gains) losses on disposals	5,040		3,267
Total costs and expenses	8,663		5,921
Earnings (loss) from operations before equity in earnings of subsidiaries	20,789		18,926
Equity in earnings of subsidiaries	0		0
Earnings from operations	20,789		18,926
Interest income (expense)	(19,024)		(15,298)
Pretax earnings	1,765		3,628
Income tax expense	(673)		(1,390)
Earnings available to common shareholders	1,092		2,238
Operating Segments [Member] | Moving and Storage Operating Eliminations [Member] | Moving and Storage Consolidations [Member]
Revenues:
Self-moving equipment rentals	0		0
Self-storage revenues	0		0
Self-moving and self-storage products and service sales	0		0
Property management fees	0		0
Life insurance premiums	0		0
Property and casualty insurance premiums	0		0
Net investment and interest income	0		0
Other revenue	(29,530)	[2]	(26,139)	[2]
Total revenues	(29,530)		(26,139)
Costs and expenses:
Operating expenses	(29,530)	[2]	(26,139)	[2]
Commission expenses	0		0
Cost of sales	0		0
Benefits and losses	0		0
Amortization of deferred policy acquisition costs	0		0
Lease expense	0		0
Depreciation, net of (gains) losses on disposals	0		0
Total costs and expenses	(29,530)		(26,139)
Earnings (loss) from operations before equity in earnings of subsidiaries	0		0
Equity in earnings of subsidiaries	(105,714)	[3]	(94,287)	[3]
Earnings from operations	(105,714)		(94,287)
Interest income (expense)	0		0
Pretax earnings	(105,714)		(94,287)
Income tax expense	0		0
Earnings available to common shareholders	(105,714)		(94,287)
Consolidation, Eliminations [Member]
Revenues:
Self-moving equipment rentals	(692)	[4]	(434)	[4]
Self-storage revenues	0		0
Self-moving and self-storage products and service sales	0		0
Property management fees	0		0
Life insurance premiums	0		0
Property and casualty insurance premiums	0		0
Net investment and interest income	(190)	[2]	(119)	[2]
Other revenue	(116)	[2]	(115)	[2]
Total revenues	(998)		(668)
Costs and expenses:
Operating expenses	(799)	[2],[4]	(540)	[2],[4],[5]
Commission expenses	0		0
Cost of sales	0		0
Benefits and losses	0		0
Amortization of deferred policy acquisition costs	0		0
Lease expense	(44)	[2]	(46)	[2]
Depreciation, net of (gains) losses on disposals	0		0
Total costs and expenses	(843)		(586)
Earnings (loss) from operations before equity in earnings of subsidiaries	(155)		(82)
Equity in earnings of subsidiaries	(5,594)	[3]	(5,508)	[3]
Earnings from operations	(5,749)		(5,590)
Interest income (expense)	155	[2]	82	[2]
Pretax earnings	(5,594)		(5,508)
Income tax expense	0		0
Earnings available to common shareholders	$ (5,594)		$ (5,508)

[1] Balances for the quarter ended March 31, 2014

[2] Eliminate intercompany lease / interest income

[3] Eliminate equity in earnings of subsidiaries

[4] Eliminate intercompany premiums

[5] Elimination of interecompany investments