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Condensed Financial Information Of Amerco Statements Of Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Net earnings | $ 342,391 | $ 264,708 | $ 205,367
AMERCO [Member] |  |  |
Net earnings | 342,391 | 264,708 | 205,695
Other comprehensive income (loss) | (31,243) | 22,756 | 1,031
Total comprehensive income | $ 311,148 | $ 287,464 | $ 206,726

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