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Related Party Notes Receivable and Management Fees [Text] (Details) (USD $)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
SAC Holdings
     
Related party notes receivable:      
Notes receivable outstanding $ 72,397,000 $ 195,426,000  
Various Subsidiaries of Amerco | SAC Holdings
     
Related party notes receivable:      
Cash interest payments 12,600,000 17,800,000 15,800,000
Notes receivable outstanding 72,400,000    
Largest aggregate balance in reporting period 195,400,000    
Earliest maturity year 2017 2017 2017
Latest maturity year 2019 2019 2019
Repayments of SAC Holdings notes and interest receivables 127,300,000    
Amerco, U-Haul Int'l | Private Mini
     
Related party notes receivable:      
Cash interest payments 5,400,000 5,400,000 5,500,000
Notes receivable outstanding 65,900,000    
Largest aggregate balance in reporting period 66,300,000    
AMERCO | SAC Holdings, Mercury, Four SAC, Five SAC, Galaxy and Private Mini
     
Management fees revenue:      
Management fees received exclusive of reimbursed expenses $ 23,700,000 $ 22,500,000 $ 22,000,000
Management fee rate, lowest 4.00% 4.00% 4.00%
Management fee rate, highest 10.00% 10.00% 10.00%