Condensed Financial Information of AMERCO, Statements of Cash Flow, Parenthetical (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income taxes paid, net:
Income taxes paid (net of income tax refunds)	$ 195,072us-gaap_IncomeTaxesPaidNet	$ 138,384us-gaap_IncomeTaxesPaidNet	$ 144,682us-gaap_IncomeTaxesPaidNet
AMERCO [Member]
Income taxes paid, net:
Income taxes paid (net of income tax refunds)	$ 195,100	$ 138,400	$ 144,700

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration