Reportable Segment Information - Assets by Operating Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Assets [Abstract]
Total assets	$ 19,058,758	$ 18,100,734	$ 17,327,183	$ 14,651,606	$ 14,693,044
Operating Segments [Member] | Moving and Storage Consolidations [Member]
Assets [Abstract]
Total assets	16,149,748	15,211,493
Operating Segments [Member] | Property and Casualty Insurance [Member]
Assets [Abstract]
Total assets	501,566	459,897
Operating Segments [Member] | Life Insurance [Member]
Assets [Abstract]
Total assets	2,990,903	2,891,574
Intersegment Eliminations [Member]
Assets [Abstract]
Total assets	$ 583,459	$ 462,230