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Related Party Notes Receivable and Management Fees [Text] (Details) (USD $)
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2012
SAC Holdings
     
Related party notes receivable:      
Notes receivable outstanding $ 73,053,000   $ 195,426,000
Various Subsidiaries of Amerco | SAC Holdings
     
Related party notes receivable:      
Cash interest payments 7,200,000 4,300,000  
Earliest maturity year 2019 2019  
Latest maturity year 2024 2024  
Repayments of SAC Holdings notes and interest receivables 127,300,000    
Amerco and U-Haul Int'l | Private Mini
     
Related party notes receivable:      
Cash interest payments 1,400,000 1,400,000  
Notes receivable outstanding 66,200,000   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 $ 9,400,000 $ 8,600,000  
Management fee rate, lowest 4.00% 4.00%  
Management fee rate, highest 10.00% 10.00%