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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]    
Property Management Fee [Abstract]    
Property Management Fee Revenue $ 22.7 $ 23.8
Related party costs and expenses:    
Revenue, excluding dealer agreement commissions and expenses 18.3  
Expenses, related parties 2.0  
Cash flow, related party 16.5  
Revenue generated by the dealer agreement from related parties 236.4  
Commission expenses, generated from dealer agreement with related parties $ 50.0  
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Minimum [Member]    
Property Management Fee [Abstract]    
Management fee rate 4.00%  
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Maximum [Member]    
Property Management Fee [Abstract]    
Management fee rate 10.00%  
Various Subsidiaries of Amerco [Member]    
Related party costs and expenses:    
Proceeds from sale of property sold, amount $ 15.0  
Payments To Acquire Buildings $ 11.5