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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member]    
Related party costs and expenses:    
Revenue, excluding dealer agreement commissions and expenses $ 21.4  
Expenses, related parties 2.0  
Cash flow, related party 72.9  
Revenue, generated by the dealer agreement from related parties 218.6  
Commission expenses, generated from dealer agreement with related parties 46.9  
Various Subsidiaries of Amerco [Member] | Sac Holdings [Member]    
Related party notes receivable:    
Cash interest payments 8.7 $ 3.4
Largest aggregate balance in reporting period 48.1  
AMERCO [Member] | Sac Holdings [Member]    
Related party notes receivable:    
One time cash interest proceeds 53.0  
AMERCO [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]    
Management fees revenue:    
Management fees received exclusive of reimbursed expenses $ 23.3 $ 21.8
AMERCO [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Minimum [Member]    
Management fees revenue:    
Management fee rate 4.00% 4.00%
AMERCO [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Maximum [Member]    
Management fees revenue:    
Management fee rate 10.00% 10.00%