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Related Party Notes Receivable and Management Fees [Text] (Details) (Moving and Storage Operating Segment, Operating Segments, USD $)
6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
SAC Holdings | Various Subsidiaries of Amerco
   
Related party notes receivable:    
Cash interest payments $ 13,900,000 $ 8,900,000
Notes receivable outstanding 72,000,000  
Largest aggregate balance in reporting period 72,400,000  
Earliest maturity year 2017 2017
Latest maturity year 2019 2019
Private Mini | Amerco, U-Haul Int'l
   
Related party notes receivable:    
Cash interest payments 2,700,000 2,700,000
Notes receivable outstanding 65,700,000  
Largest aggregate balance in reporting period 65,900,000  
SAC Holdings, Mercury, Four SAC, Five SAC, Galaxy and Private Mini | AMERCO
   
Management fees revenue:    
Management fees received exclusive of reimbursed expenses $ 15,700,000 $ 14,400,000
Management fee rate, lowest 4.00% 4.00%
Management fee rate, highest 10.00% 10.00%