Consolidating Financial Information by Operating Segment - (Revenues and Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Revenues [Abstract]
Revenues	$ 1,339,514	$ 1,375,336	$ 4,529,682	$ 4,676,040
Earnings from operations before equity in earnings of subsidiaries, total	197,588	320,011	1,019,601	1,335,459
Operating Segments [Member] | Moving and Storage Consolidations [Member]
Revenues [Abstract]
Revenues	1,260,677	1,296,407	4,285,768	4,456,863
Earnings from operations before equity in earnings of subsidiaries, total	180,467	304,717	968,862	1,301,277
Operating Segments [Member] | Property and Casualty Insurance [Member]
Revenues [Abstract]
Revenues	29,303	28,466	88,994	74,911
Earnings from operations before equity in earnings of subsidiaries, total	9,421	10,846	36,822	24,883
Operating Segments [Member] | Life Insurance [Member]
Revenues [Abstract]
Revenues	52,715	52,962	163,918	152,761
Earnings from operations before equity in earnings of subsidiaries, total	8,075	4,821	15,039	10,440
Intersegment Eliminations [Member]
Revenues [Abstract]
Revenues	3,181	(2,499)	(8,998)	(8,495)
Earnings from operations before equity in earnings of subsidiaries, total	$ 375	$ (373)	$ (1,122)	$ (1,141)