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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sac Holdings [Member]    
Related party costs and expenses:    
Commission expenses, generated from dealer agreement with related parties $ 5.7 $ 1.8
Cash flow, related party 26.5 20.9
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]    
Property Management Fee [Abstract]    
Property Management Fee Revenue $ 28.5 25.0
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%  
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member]    
Related party costs and expenses:    
Revenue generated by the dealer agreement from related parties $ 408.6 305.2
Commission expenses, generated from dealer agreement with related parties 84.3  
Payments For Purchase Of Other Assets 1   0.7
Various Subsidiaries of Amerco [Member]    
Related party costs and expenses:    
Revenue generated by the dealer agreement from related parties $ 28.0 $ 22.6