Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Revenues:
Self-moving equipment rentals	$ 3,624,695	$ 3,877,917	$ 3,958,807
Self-storage revenues	831,069	744,492	617,120
Self-moving and self-storage products and service sales	335,805	357,286	351,447
Property management fees	37,004	37,073	35,194
Life insurance premiums	89,745	99,149	111,027
Property and casualty insurance premiums	94,802	93,209	86,518
Net investment and Interest income	146,468	176,679	148,261
Other revenue	466,086	478,886	431,373
Total revenues	5,625,674	5,864,691	5,739,747
Costs and expenses:
Operating expenses	3,126,471	3,024,547	2,676,541
Commission expenses	384,079	416,315	429,581
Cost of sales	241,563	263,026	259,585
Benefits and losses	167,035	164,079	185,571
Amortization of deferred policy acquisition costs	24,238	27,924	33,854
Lease expense	32,654	30,829	29,910
Depreciation, net of (gains) losses on disposals	663,931	486,795	482,752
Net (gains) losses on disposal of real estate	(7,914)	(5,596)	(4,120)
Total costs and expenses	4,647,885	4,419,111	4,093,674
Earnings from operations	977,789	1,445,580	1,646,073
Other components of net periodic benefit costs	(1,458)	(1,216)	(1,120)
Other interest income	120,021	0	0
Interest expense	(256,175)	(223,958)	(167,424)
Fees on early extinguishment of debt	0	(1,009)	(956)
Pretax earnings	840,177	1,219,397	1,476,573
Income tax expense	(211,470)	(294,925)	(352,211)
Earnings available to common stockholders	$ 628,707	924,472	1,124,362
Basic earnings per common share	$ 3.04
Diluted earnings per common share	$ 3.04
Common Stock [Member]
Costs and expenses:
Earnings available to common stockholders	$ 0	$ 0	$ 0
Basic earnings per common share	$ 3.04	$ 5.54	$ 7.08
Diluted earnings per common share		$ 5.54	$ 7.08
Weighted average common shares outstanding: basic	19,607,788	19,607,788	19,607,788
Weighted average common shares outstanding: diluted	19,607,788	19,607,788	19,607,788
Nonvoting Common Stock [Member]
Costs and expenses:
Earnings available to common stockholders	$ 0	$ 0	$ 0
Basic earnings per common share	$ 3.22	$ 4.62	$ 5.58
Diluted earnings per common share	$ 3.22	$ 4.62	$ 5.58
Weighted average common shares outstanding: basic	176,470,092	176,470,092	176,470,092
Weighted average common shares outstanding: diluted	176,470,092	176,470,092	176,470,092
Nonvoting Common Stock [Member] | Common Stock [Member]
Costs and expenses:
Weighted average common shares outstanding: basic	196,077,880	196,077,880	196,077,880