Consolidating Financial Information by Operating Segment - (Revenues and Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Revenues [Abstract]
Revenues	$ 1,548,490	$ 1,540,308
Earnings from operations before equity in earnings of subsidiaries, total	306,242	399,658
Operating Segments [Member] | Moving and Storage Consolidations [Member]
Revenues [Abstract]
Revenues	1,469,161	1,459,513
Earnings from operations before equity in earnings of subsidiaries, total	295,058	386,691
Operating Segments [Member] | Property and Casualty Insurance [Member]
Revenues [Abstract]
Revenues	28,178	27,839
Earnings from operations before equity in earnings of subsidiaries, total	11,483	11,982
Operating Segments [Member] | Life Insurance [Member]
Revenues [Abstract]
Revenues	53,749	55,681
Earnings from operations before equity in earnings of subsidiaries, total	47	1,356
Intersegment Eliminations [Member]
Revenues [Abstract]
Revenues	2,598	2,725
Earnings from operations before equity in earnings of subsidiaries, total	$ 252	$ 371