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Related Party Transactions (Related Party Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | ---
Related party assets: |  |  |
Related party assets |  | $ 91,705 | $ 85,734
Sac Holdings [Member] |  |  |
Related party assets: |  |  |
Notes receivable |  | 48,429 | 49,322
U-Haul interest receivable |  | 5,288 | 4,970
U-Haul receivables |  | 27,466 | 23,127
Mercury [Member] |  |  |
Related party assets: |  |  |
U-Haul receivables |  | 9,930 | 8,016
Insurance Group [Member] |  |  |
Related party assets: |  |  |
Other | [1] | $ 592 | $ 299
[1] | Timing differences for intercompany balances with insurance subsidiaries resulting from the three month difference in reporting periods.

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