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Related Party Transactions (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2015
Sac Holdings [Member] |  |  |  |  |
Related party notes receivable: |  |  |  |  |
Notes receivable outstanding | $ 49,614 |  | $ 49,614 |  | $ 50,428
Related party costs and expenses: |  |  |  |  |
Expenses, related parties | 654 | $ 654 | 1,962 | $ 1,964 |
Commission expenses, generated from dealer agreement with related parties | 11,521 | 10,905 | 40,780 | 39,131 |
Private Mini [Member] |  |  |  |  |
Related party costs and expenses: |  |  |  |  |
Commission expenses, generated from dealer agreement with related parties | 841 | $ 734 | 2,879 | 2,568 |
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member] |  |  |  |  |
Related party costs and expenses: |  |  |  |  |
Revenue, excluding dealer agreement commissions and expenses |  |  | 21,500 |  |
Expenses, related parties |  |  | 2,000 |  |
Cash flow, related party |  |  | 77,800 |  |
Revenue, generated by the dealer agreement from related parties |  |  | 202,800 |  |
Commission expenses, generated from dealer agreement with related parties |  |  | 43,700 |  |
Various Subsidiaries of Amerco [Member] | Sac Holdings [Member] |  |  |  |  |
Related party notes receivable: |  |  |  |  |
Cash interest payments |  |  | 3,400 | 4,600 |
Notes receivable outstanding | 50,400 |  | 50,400 |  |
Largest aggregate balance in reporting period | 49,600 |  | $ 49,600 |  |
Earliest maturity year |  |  | 2017 |  |
AMERCO and UHaul International, Inc [Member] | Private Mini [Member] |  |  |  |  |
Related party notes receivable: |  |  |  |  |
Cash interest payments |  |  | $ 1,500 | 4,000 |
Notes receivable outstanding | $ 56,500 |  | 56,500 |  |
One time cash note and interest proceeds |  |  | 56,800 |  |
AMERCO and UHaul International, Inc [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] |  |  |  |  |
Management fees revenue: |  |  |  |  |
Management fees received exclusive of reimbursed expenses |  |  | $ 21,400 | $ 20,600 |
AMERCO and UHaul International, Inc [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Minimum [Member] |  |  |  |  |
Management fees revenue: |  |  |  |  |
Management fee rate |  |  | 4.00% | 4.00% |
AMERCO and UHaul International, Inc [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Maximum [Member] |  |  |  |  |
Management fees revenue: |  |  |  |  |
Management fee rate |  |  | 10.00% | 10.00% |

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