Consolidating Financial Information by Operating Segment - (Revenues and Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Revenues [Abstract]
Revenues	$ 1,388,558	$ 1,339,514	$ 4,595,156	$ 4,529,682
Earnings from operations before equity in earnings of subsidiaries, total	150,732	197,588	758,930	1,019,601
Operating Segments [Member] | Moving and Storage Consolidations [Member]
Revenues [Abstract]
Revenues	1,296,556	1,260,677	4,339,360	4,285,768
Earnings from operations before equity in earnings of subsidiaries, total	127,277	180,467	703,030	968,862
Operating Segments [Member] | Property and Casualty Insurance [Member]
Revenues [Abstract]
Revenues	38,141	29,303	97,780	88,994
Earnings from operations before equity in earnings of subsidiaries, total	19,463	9,421	44,769	36,822
Operating Segments [Member] | Life Insurance [Member]
Revenues [Abstract]
Revenues	56,762	52,715	166,668	163,918
Earnings from operations before equity in earnings of subsidiaries, total	4,244	8,075	11,887	15,039
Intersegment Eliminations [Member]
Revenues [Abstract]
Revenues	2,901	3,181	8,652	8,998
Earnings from operations before equity in earnings of subsidiaries, total	$ 252	$ 375	$ 756	$ 1,122