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Related Party Transactions (Related Party Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Related party assets:    
Related party assets $ 80,923 $ 86,168
Sac Holdings [Member]    
Related party assets:    
Notes receivable 47,460 48,098
U-Haul interest receivable 5,614 5,397
Blackwater [Member]    
Related party assets:    
U-Haul receivables 22,357 23,202
Mercury [Member]    
Related party assets:    
U-Haul receivables 4,938 9,195
Insurance Group [Member]    
Related party assets:    
Other [1] $ 554 $ 276
[1] Timing differences for intercompany balances with insurance subsidiaries resulting from the three month difference in reporting periods