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Subsequent Events (Details) (Mortgages, Various Subsidiaries of Amerco Real Estate and U-Haul Int'l, USD $)
In Millions, unless otherwise specified
0 Months Ended
Oct. 08, 2013
Subsequent event, loan agreement number 1
Oct. 04, 2013
Subsequent event, loan agreement number 2
Debt instruments, interest rate:    
Debt instrument, interest rate, stated percentage   5.12%
Debt instruments, interest rate, effective percentage:    
Applicable margin interest rate 2.50%  
Debt instrument:    
Debt instrument, face amount $ 100.0 $ 50.0
Loan maturity:    
Debt instrument, maturity date Oct. 08, 2016 Oct. 04, 2033
Miscellaneous information:    
Optional extension 4 years 0 months 0 days  
Date of subsequent event Oct. 08, 2013 Oct. 04, 2013