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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member]    
Related party costs and expenses:    
Revenue, excluding dealer agreement commissions and expenses $ 6.2  
Expenses, related parties 0.7  
Cash flow, related party 5.4  
Revenue, generated by the dealer agreement from related parties 75.4  
Commission expenses, generated from dealer agreement with related parties 16.5  
Amerco Real Estate Co and Uhaul International, Inc [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]    
Management fees revenue:    
Management fees received exclusive of reimbursed expenses $ 10.3 $ 10.0
Amerco Real Estate Co and Uhaul International, Inc [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 Real Estate Co and Uhaul International, Inc [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%