Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Self-moving equipment rentals	$ 898,819	$ 975,552	$ 3,151,619	$ 3,189,990
Self-storage revenues	190,483	159,424	549,246	450,302
Self moving and self-storage products and service sales	74,851	75,402	281,066	272,478
Property management fees	10,080	9,651	28,496	26,847
Life insurance premiums	24,399	27,010	75,636	84,628
Property and casualty insurance premiums	26,852	25,618	72,542	64,986
Net investment and interest income	52,294	31,184	116,376	102,963
Other revenue	97,558	100,495	401,059	349,252
Total revenues	1,375,336	1,404,336	4,676,040	4,541,446
Costs and expenses:
Operating expenses	733,469	658,095	2,278,230	1,968,698
Commission expenses	95,980	105,155	339,814	346,200
Cost of sales	54,616	57,042	206,912	193,448
Benefits and losses	41,372	47,266	122,835	139,194
Amortization of deferred policy acquisition costs	6,979	7,947	21,623	23,520
Lease expense	7,792	7,394	22,951	22,482
Depreciation, net of (gains) losses on disposals	113,866	103,736	344,980	361,201
Net (gains) losses on disposal of real estate	859	977	5,038	(2,930)
Total costs and expenses	1,054,933	987,612	3,342,383	3,051,813
Earnings from operations	320,403	416,724	1,333,657	1,489,633
Other components of net periodic benefit costs	(304)	(280)	(912)	(840)
Interest expense	(59,041)	(44,042)	(166,033)	(122,765)
Fees on early extinguishment of debt	(50)	(956)	(1,009)	(956)
Pretax earnings	261,008	371,446	1,165,703	1,365,072
Income tax expense	(61,764)	(89,980)	(280,442)	(328,533)
Earnings available to common stockholders	199,244	281,466	885,261	1,036,539
Common Stock [Member]
Costs and expenses:
Earnings available to common stockholders	$ 0	$ 0	$ 0	$ 0
Basic and diluted earnings per share of Common Stock	$ 0.98	$ 1.89	$ 5.38	$ 6.64
Weighted average shares outstanding of Common Stock: Basic and diluted	19,607,788	19,607,788	19,607,788	19,607,788
Nonvoting Common Stock [Member]
Costs and expenses:
Earnings available to common stockholders	$ 0	$ 0	$ 0	$ 0
Basic and diluted earnings per share of Common Stock	$ 1.02	$ 1.39	$ 4.42	$ 5.14
Weighted average shares outstanding of Common Stock: Basic and diluted	176,470,092	176,470,092	176,470,092	176,470,092
Nonvoting Common Stock [Member] | Common Stock [Member]
Costs and expenses:
Weighted average shares outstanding of Common Stock: Basic and diluted	196,077,880	196,077,880	196,077,880	196,077,880