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Related Party Transactions (Related Party Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Mar. 31, 2016
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Related party assets: |  |  |
Related party assets |  | $ 80,171 | $ 85,734
Private Mini [Member] |  |  |
Related party assets: |  |  |
U-Haul notes, receivables and interest |  | 2,394 | 2,752
Sac Holdings [Member] |  |  |
Related party assets: |  |  |
Notes receivable |  | 48,742 | 49,322
U-Haul interest receivable |  | 5,167 | 4,970
U-Haul receivables |  | 18,013 | 20,375
Mercury [Member] |  |  |
Related party assets: |  |  |
U-Haul receivables |  | 5,105 | 8,016
Insurance Group [Member] |  |  |
Related party assets: |  |  |
Other | [1] | $ 750 | $ 299
[1] | Timing differences for intercompany balances with insurance subsidiaries resulting from the three month difference in reporting periods

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