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Related Party Transactions (Related Party Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Mar. 31, 2017
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Related party assets: |  |  |
Related party assets |  | $ 80,865 | $ 86,168
Sac Holdings [Member] |  |  |
Related party assets: |  |  |
Notes receivable |  | 47,783 | 48,098
U-Haul interest receivable |  | 5,498 | 5,397
U-Haul receivables |  | 20,050 | 23,202
Mercury [Member] |  |  |
Related party assets: |  |  |
U-Haul receivables |  | 4,804 | 9,195
Insurance Group [Member] |  |  |
Related party assets: |  |  |
Other | [1] | $ 2,730 | $ 276
[1] | Timing differences for intercompany balances with insurance subsidiaries resulting from the three month difference in reporting periods

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