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Related Party Transactions (Related Party Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Related party assets:    
U-Haul receivables $ 9,828 $ 5,523
Related party assets 34,784 30,889
Blackwater [Member]    
Related party assets:    
Notes receivable 25,293 25,158
Mercury [Member]    
Related party assets:    
Notes receivable 9,893 7,234
Insurance Subsidiaries [Member]    
Related party assets:    
Other $ (402) $ (1,503)