Related Party Transactions (Related Party Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Related party assets:
U-Haul receivables	$ 6,364	$ 10,247
Related party assets	47,851	35,395
Blackwater [Member]
Related party assets:
Notes receivable	41,364	27,116
Mercury [Member]
Related party assets:
Notes receivable	5,708	9,632
Insurance Subsidiaries [Member]
Related party assets:
Other	$ 779	$ (1,353)

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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+ Details