Consolidating Financial Information by Operating Segment - (Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023
Assets [Abstract]
Total assets	$ 20,126,551	$ 19,058,758	$ 19,021,450
Operating Segments [Member] | Moving and Storage Consolidations [Member]
Assets [Abstract]
Total assets	17,164,316	16,149,748
Operating Segments [Member] | Property and Casualty Insurance [Member]
Assets [Abstract]
Total assets	516,162	501,566
Operating Segments [Member] | Life Insurance [Member]
Assets [Abstract]
Total assets	3,058,427	2,990,903
Intersegment Eliminations [Member]
Assets [Abstract]
Total assets	$ 612,354	$ 583,459