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Condensed Financial Information of AMERCO, Statements of Cash Flow, Parenthetical (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Income taxes paid, net:      
Income taxes paid (net of income tax refunded received) $ 144,682 $ 10,739 $ 14,265