Consolidating Financial Information by Operating Segment - (Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023
Assets [Abstract]
Total assets	$ 19,305,427	$ 19,058,758	$ 18,614,034
Operating Segments [Member] | Moving and Storage Consolidations [Member]
Assets [Abstract]
Total assets	16,447,193	16,149,748
Operating Segments [Member] | Property and Casualty Insurance [Member]
Assets [Abstract]
Total assets	502,814	501,566
Operating Segments [Member] | Life Insurance [Member]
Assets [Abstract]
Total assets	2,957,781	2,990,903
Intersegment Eliminations [Member]
Assets [Abstract]
Total assets	$ 602,361	$ 583,459