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