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Related Party Transactions (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2017
SAC Holding [Member] |  |  |  |  |
Related party notes receivable: |  |  |  |  |
Notes receivable outstanding | $ 47,460 |  | $ 47,460 |  | $ 48,098
Blackwater [Member] |  |  |  |  |
Related party costs and expenses: |  |  |  |  |
Expenses, related parties | 675 | $ 684 | 1,356 | $ 1,372 |
Commission expenses, generated from dealer agreement with related parties | 17,556 | $ 17,128 | 33,442 | 32,881 |
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member] |  |  |  |  |
Related party costs and expenses: |  |  |  |  |
Revenue, excluding dealer agreement commissions and expenses |  |  | 14,800 |  |
Expenses, related parties |  |  | 1,400 |  |
Cash flow, related party |  |  | 13,700 |  |
Revenue, generated by the dealer agreement from related parties |  |  | 155,200 |  |
Commission expenses, generated from dealer agreement with related parties |  |  | 33,400 |  |
Various Subsidiaries of Amerco [Member] | SAC Holding [Member] |  |  |  |  |
Related party notes receivable: |  |  |  |  |
Cash interest payments |  |  | 2,200 | 2,300 |
Notes receivable outstanding | 47,500 |  | 47,500 |  |
Largest aggregate balance in reporting period | $ 48,100 |  | $ 48,100 |  |
Earliest maturity year |  |  | 2017 |  |
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 |  |  | $ 17,000 | $ 15,500 |
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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- Definition The US-GAAP taxonomy only contains a single date for related party transactions. RelatedPartyTransaction Date. We disclose our earliest and latest maturities on the various outstanding notes only by the year. + References No definition available. + Details
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