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Accounting Policies (Narratives) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) Segment | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
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 | $ 29,300,000 | $ 29,600,000 |  |  |
LIFO Method Related Items [Abstract] |  |  |  |  |
Percentage of LIFO inventory | 94.00% | 94.00% |  |  |
Inventory, LIFO reserve | $ 46,331,000 | $ 47,065,000 |  |  |
Effect of LIFO inventory liquidation on income |  | 1,600,000 | $ 100,000 |  |
Disposition of Property, Plant and Equipment |  |  |  |  |
Net amount of (gains) losses netted against depreciation expense | $ 154,000,000 | $ 247,100,000 | 214,200,000 |  |
Allowance For Credit Loss [Abstract] |  |  |  |  |
Trade receivable components | Segment | 2 |  |  |  |
Average Historical Chargeback Term | For credit card receivables, the Company uses a trailing 13 months average historical chargeback percentage of total credit card receivables. The Company rents equipment to corporate customers in which payment terms are 30 days. |  |  |  |
Percentage of estimated gain loss | 5.00% | 4.00% |  |  |
Allowance for expected credit losses | $ 2,300,000 | $ 3,800,000 |  |  |
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] |  |  |  |  |
Policy benefits and losses, claims and loss expenses payable | 849,113,000 | 880,202,000 |  | $ 909,701,000 | $ 1,040,951,000
Guaranteed Interest Contracts | 2,411,400,000 | 2,398,900,000 |  |  |
Self insurance reserve | 318,900,000 | 335,200,000 |  |  |
Accrued insurance, noncurrent | 396,900,000 |  |  |  |
Retained earnings | $ 7,600,090,000 | 7,003,148,000 |  | $ 5,025,568,000 | $ 5,017,451,000
Leases [Abstract] |  |  |  |  |
Finance lease term | 7 years |  |  |  |
Marketing and Advertising Expense [Abstract] |  |  |  |  |
Advertising expense | $ 13,800,000 | 11,100,000 | 13,700,000 |  |
Policyholder Benefits and Claims Incurred [Abstract] |  |  |  |  |
Deferred sales inducements, net | 14,900,000 | 16,600,000 |  |  |
Deferred sales inducements, amortization expense | 2,900,000 | 3,700,000 | $ 4,700,000 |  |
All Nonrental Equipment [Member] |  |  |  |  |
LIFO Method Related Items [Abstract] |  |  |  |  |
Inventory, LIFO reserve | $ 46,300,000 | 47,100,000 |  |  |
Revision Of Prior Period Accounting Standards Update Adjustment [Member] |  |  |  |  |
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] |  |  |  |  |
Policy benefits and losses, claims and loss expenses payable |  | 5,168,000 |  |  |
Retained earnings |  | 5,567,000 |  |  |
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] |  |  |  |  |
Leases [Abstract] |  |  |  |  |
Operating lease term | 88 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 | $ 20,400,000 | $ 21,600,000 |  |  |

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