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Related Party Notes Receivable and Management Fees [Text] (Details) (USD $) |  |  | 9 Months Ended
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Dec. 31, 2012 SAC Holdings | Mar. 31, 2012 SAC Holdings | Dec. 31, 2012 Various Subsidiaries of Amerco SAC Holdings | Dec. 31, 2011 Various Subsidiaries of Amerco SAC Holdings | Dec. 31, 2012 Amerco, U-Haul Int'l Private Mini | Dec. 31, 2011 Amerco, U-Haul Int'l Private Mini | Dec. 31, 2012 Amerco, Business Segment [Member] SAC Holdings, Mercury, Four SAC, Five SAC, Galaxy and Private Mini | Dec. 31, 2011 Amerco, Business Segment [Member] SAC Holdings, Mercury, Four SAC, Five SAC, Galaxy and Private Mini
Related party notes receivable: |  |  |  |  |  |  |  |
Cash interest payments |  |  | $ 11,000,000 | $ 13,000,000 | $ 4,000,000 | $ 4,000,000 |  |
Notes receivable outstanding | (72,634,000) | (195,426,000) | (195,000,000) | (73,000,000) | (66,000,000) | (66,000,000) |  |
Earliest maturity year |  |  | 2019 | 2019 |  |  |  |
Latest maturity year |  |  | 2024 | 2024 |  |  |  |
Repayments of SAC Holdings notes and interest receivables |  |  | (127,000,000) |  |  |  |  |
Management fees revenue: |  |  |  |  |  |  |  |
Management fees received exclusive of reimbursed expenses |  |  |  |  |  |  | $ 19,000,000 | $ 18,000,000
Management fee rate, lowest |  |  |  |  |  |  | 4.00% | 4.00%
Management fee rate, highest |  |  |  |  |  |  | 10.00% | 10.00%

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