Schedule I - Condensed Financial Information Of AMERCO (Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Net earnings	$ 398,424	$ 489,001	$ 356,741
Amerco [Member]
Net earnings	398,424	489,001	356,741
Other comprehensive income (loss)	9,289	(26,160)	19,558
Total comprehensive income	$ 407,713	$ 462,841	$ 376,299