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Related Party Transactions (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Mar. 31, 2017
Sac Holdings [Member] |  |  |
Related party notes receivable: |  |  |
Notes receivable outstanding | $ 47,783 |  | $ 48,098
Related party costs and expenses: |  |  |
Expenses, related parties | 681 | $ 688 |
Commission expenses, generated from dealer agreement with related parties | 14,926 | 14,701 |
Private Mini [Member] |  |  |
Related party costs and expenses: |  |  |
Commission expenses, generated from dealer agreement with related parties | 960 | 1,052 |
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member] |  |  |
Related party costs and expenses: |  |  |
Revenue, excluding dealer agreement commissions and expenses | 7,400 |  |
Expenses, related parties | 700 |  |
Cash flow, related party | 6,600 |  |
Revenue, generated by the dealer agreement from related parties | 72,800 |  |
Commission expenses, generated from dealer agreement with related parties | 15,900 |  |
Various Subsidiaries of Amerco [Member] | Sac Holdings [Member] |  |  |
Related party notes receivable: |  |  |
Cash interest payments | 1,100 | 1,100 |
Notes receivable outstanding | $ 48,100 |  |
Largest aggregate balance in reporting period |  | 47,800 |
Earliest maturity year | 2017 |  |
Amerco Real Estate Co 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 | $ 10,000 | $ 8,700 |
Amerco Real Estate Co 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 Real Estate Co 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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