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v3.25.1

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 |  |

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