Consolidating Financial Information by Operating Segment - (Revenues and Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues [Abstract]
Revenues	$ 1,658,108	$ 1,649,860	$ 3,206,598	$ 3,190,168
Earnings from operations before equity in earnings of subsidiaries, total	301,956	422,355	608,198	822,013
Operating Segments [Member] | Moving and Storage Consolidations [Member]
Revenues [Abstract]
Revenues	1,573,643	1,565,578	3,042,804	3,025,091
Earnings from operations before equity in earnings of subsidiaries, total	280,695	401,704	575,753	788,395
Operating Segments [Member] | Property and Casualty Insurance [Member]
Revenues [Abstract]
Revenues	31,461	31,852	59,639	59,691
Earnings from operations before equity in earnings of subsidiaries, total	13,823	15,419	25,306	27,401
Operating Segments [Member] | Life Insurance [Member]
Revenues [Abstract]
Revenues	56,157	55,522	109,906	111,203
Earnings from operations before equity in earnings of subsidiaries, total	7,690	5,608	7,643	6,964
Intersegment Eliminations [Member]
Revenues [Abstract]
Revenues	3,153	3,092	5,751	5,817
Earnings from operations before equity in earnings of subsidiaries, total	$ 252	$ 376	$ 504	$ 747