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Accounting Policies (Narratives) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Jan. 01, 2021
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 | 94.00% | 93.00% |  |
Inventory, LIFO reserve | $ 47,065,000 | $ 37,400,000 |  |
Effect of LIFO inventory liquidation on income | 1,600,000 | 100,000 | $ 400,000 |
Disposition of Property, Plant and Equipment |  |  |  |
Net amount of (gains) losses netted against depreciation expense | $ 247,100,000 | 214,200,000 | 54,100,000 |
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% |  |  |
Salvage value percentage | 5.70% |  |  |
Real Estate Companies Disclosures [Abstract] |  |  |  |
Carrying value of surplus real estate | $ 72,200,000 | 67,800,000 |  |
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] |  |  |  |
Accrued insurance, noncurrent | 21,600,000 | 19,700,000 |  |
Marketing and Advertising Expense [Abstract] |  |  |  |
Advertising expense | 11,100,000 | 13,700,000 | 18,000,000.0 |
Policyholder Benefits and Claims Incurred [Abstract] |  |  |  |
Deferred sales inducements, net | 16,600,000 | 15,700,000 |  |
Deferred sales inducements, amortization expense | 3,700,000 | 4,700,000 | 4,300,000 |
Adoption of New Accounting Pronounements |  |  |  |
Other components of net periodic benefit cost | 1,216,000 | 1,120,000 | $ 987,000 |
Operating lease commitment, asset | 474,765,000 | 620,824,000 |  |
Operating lease commitment, liability | 58,373,000 |  |  |
Prior Period Adjustment [Abstract] |  |  |  |
Equity impact, net | 6,528,335,000 | 5,952,492,000 |  |
All Nonrental Equipment [Member] |  |  |  |
LIFO Method Related Items [Abstract] |  |  |  |
Inventory, LIFO reserve | $ 47,100,000 | $ 37,400,000 |  |
Accumulated Other Comprehensive Income (Loss) [Member] | Minimum [Member] | Revision Of Prior Period Accounting Standards Update Adjustment [Member] |  |  |  |
Prior Period Adjustment [Abstract] |  |  |  |
Equity impact, net |  |  |  | $ 110,000,000.0
Accumulated Other Comprehensive Income (Loss) [Member] | Maximum [Member] | Revision Of Prior Period Accounting Standards Update Adjustment [Member] |  |  |  |
Prior Period Adjustment [Abstract] |  |  |  |
Equity impact, net |  |  |  | $ 130,000,000.0

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