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Related Party Notes Receivable and Management Fees [Text] (Details) (USD $)
6 Months Ended
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2012
SAC Holdings
Mar. 31, 2012
SAC Holdings
Sep. 30, 2012
SAC Holdings, Mercury, Four SAC, Five SAC, Galaxy and Private Mini
Sep. 30, 2011
SAC Holdings, Mercury, Four SAC, Five SAC, Galaxy and Private Mini
Sep. 30, 2012
Various Subsidiaries of Amerco
SAC Holdings
Sep. 30, 2011
Various Subsidiaries of Amerco
SAC Holdings
Sep. 30, 2012
Amerco, U-Haul Int'l
Private Mini
Sep. 30, 2011
Amerco, U-Haul Int'l
Private Mini
Related party notes receivable:                    
Cash interest payments             $ 9,000,000 $ 10,000,000 $ 3,000,000 $ 3,000,000
Notes receivable outstanding (72,852,000) (195,426,000) (72,852,000) (195,426,000)         (66,000,000)  
Largest aggregate balance in reporting period             (195,000,000)   (66,000,000)  
Earliest maturity year             2019 2019    
Latest maturity year             2024 2024    
Repayments of SAC Holdings notes and interest receivables             (127,000,000)      
Management fees revenue:                    
Management fees received exclusive of reimbursed expenses         $ 14,000,000 $ 14,000,000        
Management fee rate, lowest         4.00% 4.00%        
Management fee rate, highest         10.00% 10.00%