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Accounting Policies (Narratives) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Cash, Insured and Uninsured [Abstract]      
Cash, FDIC Insured Amount   $ 250,000  
Cash, CDIC insured amount   100,000  
Reinsurance Disclosures [Abstract]      
Available for sale securities, accrued interest receivable $ 29,400,000 $ 29,300,000  
LIFO Method Related Items [Abstract]      
Percentage of LIFO inventory 95.00% 94.00%  
Inventory, LIFO reserve $ 47,929,000 $ 46,331,000  
Effect of LIFO inventory liquidation on income 300,000 600,000 $ 1,600,000
Disposition of Property, Plant and Equipment      
Net amount of (gains) losses netted against depreciation expense 13,700,000 154,000,000 247,100,000
Additional operating expenses $ 76,200,000 75,600,000  
Allowance For Credit Loss [Abstract]      
Average Historical Chargeback Term The Company rents equipment to corporate customers in which payment terms are 30 days.    
Allowance for expected credit losses $ 5,100,000    
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]      
Policy benefits and losses, claims and loss expenses payable 857,521,000 849,113,000  
Guaranteed Interest Contracts 2,511,400,000 2,411,400,000  
Self insurance reserve 360,800,000 318,900,000  
Accrued insurance, noncurrent 25,600,000 20,400,000  
Retained earnings $ 7,931,886,000 7,600,090,000  
Leases [Abstract]      
Finance lease term 7 years    
Marketing and Advertising Expense [Abstract]      
Advertising expense $ 15,300,000 13,800,000 11,100,000
Deferred Sales Inducements [Abstract]      
Deferred sales inducements, net 13,600,000 14,900,000  
Deferred sales inducements, amortization expense $ 1,900,000 2,900,000 $ 700,000
All Nonrental Equipment [Member]      
LIFO Method Related Items [Abstract]      
Inventory, LIFO reserve   $ 46,300,000  
Minimum [Member] | Moving and Storage Operating Segment [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Estimated useful lives 10 years    
Minimum [Member] | Rental Equipment [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Estimated useful lives 2 years    
Minimum [Member] | Buildings and Non-rental Equipment [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Estimated useful lives 3 years    
Maximum [Member] | Moving and Storage Operating Segment [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Estimated useful lives 55 years    
Maximum [Member] | Rental Equipment [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Estimated useful lives 20 years    
Maximum [Member] | Buildings and Non-rental Equipment [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Estimated useful lives 10 years    
Life Insurance Segment [Member]      
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]      
Policy benefits and losses, claims and loss expenses payable $ 368,900,000