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Related Party Notes Receivable and Management Fees [Text] (Details) (USD $) | 12 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
SAC Holdings |  |  |
Related party notes receivable: |  |  |
Notes receivable outstanding | $ 72,397,000 | $ 195,426,000 |
Various Subsidiaries of Amerco | SAC Holdings |  |  |
Related party notes receivable: |  |  |
Cash interest payments | 12,600,000 | 17,800,000 | 15,800,000
Notes receivable outstanding | 72,400,000 |  |
Largest aggregate balance in reporting period | 195,400,000 |  |
Earliest maturity year | 2017 | 2017 | 2017
Latest maturity year | 2019 | 2019 | 2019
Repayments of SAC Holdings notes and interest receivables | 127,300,000 |  |
Amerco, U-Haul Int'l | Private Mini |  |  |
Related party notes receivable: |  |  |
Cash interest payments | 5,400,000 | 5,400,000 | 5,500,000
Notes receivable outstanding | 65,900,000 |  |
Largest aggregate balance in reporting period | 66,300,000 |  |
AMERCO | SAC Holdings, Mercury, Four SAC, Five SAC, Galaxy and Private Mini |  |  |
Management fees revenue: |  |  |
Management fees received exclusive of reimbursed expenses | $ 23,700,000 | $ 22,500,000 | $ 22,000,000
Management fee rate, lowest | 4.00% | 4.00% | 4.00%
Management fee rate, highest | 10.00% | 10.00% | 10.00%

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- Definition We provide the largest aggregate amount of related party notes receivable that occurred during this reporting period. This can be compared to the related party notes receivable balance at the end of this period. + References No definition available. + Details
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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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