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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Sac Holdings [Member]      
Related party costs and expenses:      
Payments to aquire assets, other $ 4.6    
Sac Holdings, Four Sac, Five Sac, Galaxy, Privite mini [Member]      
Related party costs and expenses:      
Revenue, excluding dealer agreement commissions and expenses 36.8 $ 29.7 $ 29.8
Expenses, related parties 7.2 2.4 2.4
Cash flow, related party   27.3 27.4
Revenue, generated by the dealer agreement from related parties 512.8 0.5 418.9
Commission expenses, generated from dealer agreement with related parties 106.2 82.1 88.1
Amerco, Uhaul Intl [Member]      
Related party notes receivable:      
Notes receivable, related party $ 37.1 $ 37.2 $ 37.0
Amerco, Uhaul Intl [Member] | Minimum [Member]      
Property Management Fee [Abstract]      
Management fee rate 4.00%    
Amerco, Uhaul Intl [Member] | Maximum [Member]      
Property Management Fee [Abstract]      
Management fee rate 10.00%