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Accounting Policies (Narratives) (Details) - USD ($)
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Cash, Insured and Uninsured [Abstract]      
Cash, FDIC Insured Amount $ 250,000    
Cash, CDIC insured amount $ 100,000    
LIFO Method Related Items [Abstract]      
Percentage of LIFO inventory 93.00% 96.00%  
Inventory, LIFO reserve $ 37,400,000 $ 21,832,000  
Effect of LIFO inventory liquidation on income 100,000    
Disposition of Property, Plant and Equipment      
Net amount of (gains) losses netted against depreciation expense 214,200,000 54,100,000 $ 27,100,000
Additional operating expenses $ 28,700,000 22,800,000 26,900,000
Schedule of rental trucks depreciation:      
Percentage reduction for year one, depreciation 16.00%    
Percentage reduction for year two, depreciation 13.00%    
Percentage reduction for year three, depreciation 11.00%    
Percentage reduction for year four, depreciation 9.00%    
Percentage reduction for year five, depreciation 8.00%    
Percentage reduction for year six, depreciation 7.00%    
Percentage reduction for year seven, depreciation 6.00%    
Salvage value percentage under the old declining balance method 15.00%    
Percentage reduction if straight line approach used each year for depreciation calculation 5.70%    
Real Estate Companies Disclosures [Abstract]      
Carrying value of surplus real estate $ 67,800,000 68,800,000  
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]      
Self insurance reserve 418,900,000 427,100,000  
Accrued insurance, noncurrent 19,700,000 17,500,000  
Marketing and Advertising Expense [Abstract]      
Advertising expense 13,700,000 18,000,000.0 13,700,000
Policyholder Benefits and Claims Incurred [Abstract]      
Deferred sales inducements, net 15,700,000 16,000,000.0  
Deferred sales inducements, amortization expense 4,700,000 4,300,000 5,500,000
Adoption of New Accounting Pronounements      
Other components of net periodic benefit cost 1,120,000 987,000 $ 1,054,000
Operating lease commitment, asset 620,824,000 877,038,000  
Operating lease commitment, liability 74,197,000    
All Nonrental Equipment [Member]      
LIFO Method Related Items [Abstract]      
Inventory, LIFO reserve $ 37,400,000 $ 21,800,000