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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]        
Related party notes receivable:        
Cash interest payments     $ 4.0  
Property Management Fee [Abstract]        
Property Management Fee Revenue     $ 24.9 $ 27.1
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] | Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member]        
Related party costs and expenses:        
Revenue, excluding dealer agreement commissions and expenses $ 22.7 $ 21.6    
Expenses, related parties $ 1.8 $ 1.8    
Cash flow, related party     $ 21.0 19.8
Revenue generated by the dealer agreement from related parties     339.5 335.3
Commission expenses, generated from dealer agreement with related parties     $ 71.3 $ 70.5