Subsequent Events (Details) (Revolving Fleet Loan, Subsidiaries of U-Haul Int'l, New Revolving Fleet Loan, USD $) In Millions, unless otherwise specified	0 Months Ended
	Jan. 31, 2014	Jan. 21, 2014
Revolving Fleet Loan | Subsidiaries of U-Haul Int'l | New Revolving Fleet Loan
Line of credit facility:
Approximate amount drawn down on closing date		$ 18
Line of credit, current borrowing capacity	100.0	75.0
Line of credit facility, maximum borrowing capacity	$ 125.0	$ 225.0
Debt instrument, maturity date	Oct. 31, 2017	Oct. 31, 2018
Number of years interest rate only will be paid	3 years 0 months 0 days	4 years 0 months 0 days
Number of months, principal payments are due after interest payments	0 years 9 months 0 days	0 years 9 months 0 days