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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, 2015	Mar. 31, 2014	Mar. 31, 2013
Net earnings	$ 356,741us-gaap_NetIncomeLoss	$ 342,391us-gaap_NetIncomeLoss	$ 264,708us-gaap_NetIncomeLoss
AMERCO [Member]
Net earnings	356,741	342,391	264,708
Other comprehensive income (loss)	19,558	(31,243)	22,756
Total comprehensive income	$ 376,299	$ 311,148	$ 287,464

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.