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Schedule V - U-Haul Holding Company and Consolidated Subsidiaries, Supplemental Information (for Property-Casualty Insurance Operations) (Details) - Property Casualty Insurance Operations [Member] - U-Haul Holding Company [Member] - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Supplemental Information For Property And Casualty Insurance Underwriters [Abstract]      
Reserves for unpaid claims and claims adjustment expense $ 125,605 $ 131,192 $ 151,874
Unearned premiums 50 158 97
Net earned premiums (1) 101,953 97,927 96,242
Net investment income (2) 19,361 25,158 7,314
Claim and claim adjustment expenses incurred related to current year 30,293 25,396 27,570
Prior years (7,663) (13,153) (5,828)
Paid claims and claim adjustment expense 24,398 27,783 22,965
Net premiums written (1) $ 101,903 $ 98,085 $ 96,145