Reportable Segment Information - (Revenues and Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Revenues [Abstract]
Revenues	$ 1,415,608	$ 1,388,558	$ 4,766,000	$ 4,595,156
Operating Expenses [Abstract]
Personnel expenses	308,494	292,289	936,215	888,153
Equipment maintenance and repair expenses	204,299	191,226	622,016	593,388
Other operating expenses	101,016	63,107	274,831	196,574
Other segment items	234,805	235,729	751,843	785,066
Operating Expenses, Total	848,614	782,351	2,584,905	2,463,181
Operating Costs and Expenses [Abstract]
Commission expenses	96,101	95,031	334,649	326,610
Cost of product sales	50,871	52,767	190,701	181,031
Benefits and losses	49,232	48,683	142,592	137,081
Amortization of deferred policy acquisition costs	4,922	4,493	14,801	13,578
Lease expense	4,281	5,052	14,226	15,386
Depreciation, net of (gains) losses on disposals	325,219	246,091	969,836	689,906
Net (gains) losses on disposal of real estate	2,696	3,358	5,610	9,453
Costs and Expenses, Total	1,381,936	1,237,826	4,257,320	3,836,226
Income (Loss) Attributable to Parent, before Tax [Abstract]
Earnings from operations before equity in earnings of subsidiaries	33,672	150,732	508,680	758,930
Earnings from operations	33,672	150,732	508,680	758,930
Other components of net periodic benefit costs	(346)	(372)	(1,037)	(1,116)
Other interest income	10,784	15,638	31,468	50,004
Interest expense	95,527	76,581	268,162	215,297
Fees and amortization on early extinguishment of debt	(163)		(189)	(495)
Pretax earnings	51,580	89,417	270,760	592,026
Income tax expense	14,612	22,251	59,847	142,645
Net earnings available to common stockholders	36,968	67,166	210,913	449,381
Operating Segments [Member] | Moving and Storage Consolidations [Member]
Revenues [Abstract]
Revenues	1,319,890	1,296,556	4,506,576	4,339,360
Operating Expenses [Abstract]
Personnel expenses	308,494	292,289	936,215	888,153
Equipment maintenance and repair expenses	204,299	191,226	622,016	593,388
Other operating expenses	101,016	63,107	274,831	196,574
Other segment items	219,237	219,838	709,391	733,956
Operating Expenses, Total	833,046	766,460	2,542,453	2,412,071
Operating Costs and Expenses [Abstract]
Commission expenses	96,101	95,031	334,649	326,610
Cost of product sales	50,871	52,767	190,701	181,031
Lease expense	4,873	5,572	15,925	17,259
Depreciation, net of (gains) losses on disposals	325,219	246,091	969,836	689,906
Net (gains) losses on disposal of real estate	2,696	3,358	5,610	9,453
Costs and Expenses, Total	1,312,806	1,169,279	4,059,174	3,636,330
Income (Loss) Attributable to Parent, before Tax [Abstract]
Earnings from operations before equity in earnings of subsidiaries	7,084	127,277	447,402	703,030
Equity in earnings of subsidiaries	21,018	17,956	48,523	43,980
Earnings from operations	28,102	145,233	495,925	747,010
Other components of net periodic benefit costs	(346)	(372)	(1,037)	(1,116)
Other interest income	10,856	15,734	31,732	50,340
Interest expense	95,555	76,833	268,246	216,053
Fees and amortization on early extinguishment of debt	(163)		(189)	(495)
Pretax earnings	57,106	83,762	258,185	579,686
Income tax expense	20,138	16,596	47,272	130,305
Net earnings available to common stockholders	36,968	67,166	210,913	449,381
Operating Segments [Member] | Property and Casualty Insurance [Member]
Revenues [Abstract]
Revenues	42,516	38,141	108,128	97,780
Operating Expenses [Abstract]
Other segment items	13,763	12,550	38,947	36,055
Operating Expenses, Total	13,763	12,550	38,947	36,055
Operating Costs and Expenses [Abstract]
Benefits and losses	7,860	6,038	19,096	16,669
Lease expense	74	90	224	287
Costs and Expenses, Total	21,697	18,678	58,267	53,011
Income (Loss) Attributable to Parent, before Tax [Abstract]
Earnings from operations before equity in earnings of subsidiaries	20,819	19,463	49,861	44,769
Earnings from operations	20,819	19,463	49,861	44,769
Pretax earnings	20,819	19,463	49,861	44,769
Income tax expense	4,358	4,072	10,341	9,293
Net earnings available to common stockholders	16,461	15,391	39,520	35,476
Operating Segments [Member] | Life Insurance [Member]
Revenues [Abstract]
Revenues	56,207	56,762	160,414	166,668
Operating Expenses [Abstract]
Other segment items	4,091	5,347	10,510	20,697
Operating Expenses, Total	4,091	5,347	10,510	20,697
Operating Costs and Expenses [Abstract]
Benefits and losses	41,372	42,645	123,496	120,412
Amortization of deferred policy acquisition costs	4,922	4,493	14,801	13,578
Lease expense	25	33	106	94
Costs and Expenses, Total	50,410	52,518	148,913	154,781
Income (Loss) Attributable to Parent, before Tax [Abstract]
Earnings from operations before equity in earnings of subsidiaries	5,797	4,244	11,501	11,887
Earnings from operations	5,797	4,244	11,501	11,887
Interest expense	72	96	264	336
Pretax earnings	5,725	4,148	11,237	11,551
Income tax expense	1,168	1,583	2,234	3,047
Net earnings available to common stockholders	4,557	2,565	9,003	8,504
Intersegment Eliminations [Member]
Revenues [Abstract]
Revenues	(3,005)	2,901	(9,118)	8,652
Operating Expenses [Abstract]
Other segment items	(2,286)	2,006	(7,005)	5,642
Operating Expenses, Total	2,286	2,006	7,005	5,642
Operating Costs and Expenses [Abstract]
Lease expense	691	643	2,029	2,254
Costs and Expenses, Total	2,977	2,649	9,034	7,896
Income (Loss) Attributable to Parent, before Tax [Abstract]
Earnings from operations before equity in earnings of subsidiaries	28	252	84	756
Equity in earnings of subsidiaries	(21,018)	17,956	(48,523)	43,980
Earnings from operations	21,046	18,208	48,607	44,736
Other interest income	(72)	96	(264)	336
Interest expense	100	348	348	1,092
Pretax earnings	21,018	17,956	48,523	43,980
Net earnings available to common stockholders	$ 21,018	$ 17,956	$ 48,523	$ 43,980