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Related Party Transactions (Related Party Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Related party assets:    
Related party assets $ 12,902 $ 30,889
Blackwater [Member]    
Related party assets:    
Notes receivable 27,828 25,158
Mercury [Member]    
Related party assets:    
Notes receivable 5,673 7,234
Insurance Group [Member]    
Related party assets:    
U-Haul receivables $ (20,599) $ (1,503)