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Consolidating financial information by industry segment (Balance Sheets) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | --- | ---
ASSETS: |  |  |
Cash and cash equivalents | $ 2,145,131 | $ 2,060,524 |
Reinsurance recoverables and trade receivables, net | 212,565 | 189,498 |
Inventories, net | 161,535 | 151,474 |
Prepaid expenses | 263,541 | 241,711 |
Investments, fixed maturities and marketable equities | 2,534,164 | 2,770,394 |
Investments, other | 650,151 | 575,540 |
Deferred policy acquisition costs, net | 121,365 | 128,463 |
Other assets | 52,769 | 51,052 |
Right of use Assets - Financing | 377,733 | 474,765 |
Right of use Assets - Operating | 65,316 | 58,917 |
Related Parties Amounts Due | 40,140 | 48,308 |
Subtotal assets | 6,624,410 | 6,750,646 |
Investments in subsidiaries | 0 | 0 |
Property, plant and equipment, at cost: |  |  |
Land | 1,613,871 | 1,537,206 |
Buildings and improvements | 7,649,849 | 7,088,810 |
Furniture and equipment | 966,211 | 928,241 |
Property, plant and equipment (gross) | 17,063,484 | 15,660,293 |
Less: Accumulated depreciation | (4,666,444) | (4,310,205) |
Total property, plant and equipment | 12,397,040 | 11,350,088 |
Total assets | 19,021,450 | 18,100,734 | $ 18,143,343
Liabilities: |  |  |
Accounts payable and accrued expenses | 757,988 | 761,039 |
Notes, loans and leases payable | 6,400,899 | 6,108,042 |
Operating lease liability | 64,580 | 58,373 |
Policy benefits and losses, claims and loss expenses payable | 865,397 | 880,202 |
Liabilities from investment contracts | 2,393,590 | 2,398,884 |
Other policyholders' funds and liabilities | 7,677 | 8,232 |
Deferred income | 56,821 | 52,282 |
Deferred income taxes, net | 1,444,120 | 1,329,489 |
Related party liabilities | 0 | 0 |
Total liabilities | 11,991,072 | 11,596,543 |
Stockholders' equity: |  |  |
Common stock, value, issued |  | 176 |
Additional paid-in capital | 453,643 | 453,643 |
Accumulated other comprehensive loss | (275,664) | (285,623) |
Retained earnings | 7,519,376 | 7,003,148 |
Total stockholders' equity | 7,030,378 | 6,504,191 |
Total liabilities and stockholders' equity | 19,021,450 | 18,100,734 |
Rental Trailers and Other Rental Equipment [Member] |  |  |
Property, plant and equipment, at cost: |  |  |
Property subject to or available for operating lease, gross | 912,046 | 827,696 |
Rental Trucks [Member] |  |  |
Property, plant and equipment, at cost: |  |  |
Property subject to or available for operating lease, gross | 5,921,507 | 5,278,340 |
Series A Preferred Stock [Member] |  |  |
Stockholders' equity: |  |  |
Preferred stock, value, issued | 0 | 0 |
Series B Preferred Stock [Member] |  |  |
Stockholders' equity: |  |  |
Preferred stock, value, issued | 0 | 0 |
Serial Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 0 | 0 |
Amerco Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 10,497 | 10,497 |
Nonvoting Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 176 | 176 |
Common Stock in Treasury [Member] |  |  |
Stockholders' equity: |  |  |
Treasury stock, value | (525,653) | (525,653) |
Preferred Stock in Treasury [Member] |  |  |
Stockholders' equity: |  |  |
Treasury stock, value | (151,997) | (151,997) |
Operating Segments [Member] | Moving and Storage Consolidations [Member] |  |  |
ASSETS: |  |  |
Cash and cash equivalents | 2,068,790 | 2,034,242 |
Reinsurance recoverables and trade receivables, net | 130,372 | 107,823 |
Inventories, net | 161,535 | 151,474 |
Prepaid expenses | 263,541 | 241,711 |
Investments, fixed maturities and marketable equities | 97,372 | 227,737 |
Investments, other | 23,330 | 23,314 |
Deferred policy acquisition costs, net | 0 | 0 |
Other assets | 46,667 | 46,438 |
Right of use Assets - Financing | 377,733 | 474,765 |
Right of use Assets - Operating | 64,378 | 57,978 |
Related Parties Amounts Due | 62,931 | 69,144 |
Subtotal assets | 3,296,649 | 3,434,626 |
Investments in subsidiaries | 462,493 | 426,779 |
Property, plant and equipment, at cost: |  |  |
Land | 1,613,871 | 1,537,206 |
Buildings and improvements | 7,649,849 | 7,088,810 |
Furniture and equipment | 966,211 | 928,241 |
Property, plant and equipment (gross) | 17,063,484 | 15,660,293 |
Less: Accumulated depreciation | (4,666,444) | (4,310,205) |
Total property, plant and equipment | 12,397,040 | 11,350,088 |
Total assets | 16,156,182 | 15,211,493 |
Liabilities: |  |  |
Accounts payable and accrued expenses | 745,606 | 729,679 |
Notes, loans and leases payable | 6,400,899 | 6,108,042 |
Operating lease liability | 63,627 | 57,418 |
Policy benefits and losses, claims and loss expenses payable | 324,642 | 335,227 |
Liabilities from investment contracts | 0 | 0 |
Other policyholders' funds and liabilities | 0 | 0 |
Deferred income | 56,821 | 52,282 |
Deferred income taxes, net | 1,514,732 | 1,405,391 |
Related party liabilities | 25,754 | 25,082 |
Total liabilities | 9,132,081 | 8,713,121 |
Stockholders' equity: |  |  |
Common stock, value, issued |  | 176 |
Additional paid-in capital | 453,853 | 453,853 |
Accumulated other comprehensive loss | (281,941) | (291,442) |
Retained earnings | 7,519,166 | 7,002,938 |
Total stockholders' equity | 7,024,101 | 6,498,372 |
Total liabilities and stockholders' equity | 16,156,182 | 15,211,493 |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Rental Trailers and Other Rental Equipment [Member] |  |  |
Property, plant and equipment, at cost: |  |  |
Property subject to or available for operating lease, gross | 912,046 | 827,696 |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Rental Trucks [Member] |  |  |
Property, plant and equipment, at cost: |  |  |
Property subject to or available for operating lease, gross | 5,921,507 | 5,278,340 |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Series A Preferred Stock [Member] |  |  |
Stockholders' equity: |  |  |
Preferred stock, value, issued | 0 | 0 |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Series B Preferred Stock [Member] |  |  |
Stockholders' equity: |  |  |
Preferred stock, value, issued | 0 | 0 |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Serial Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 0 | 0 |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Amerco Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 10,497 | 10,497 |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Nonvoting Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 176 |  |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Common Stock in Treasury [Member] |  |  |
Stockholders' equity: |  |  |
Treasury stock, value | (525,653) | (525,653) |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Preferred Stock in Treasury [Member] |  |  |
Stockholders' equity: |  |  |
Treasury stock, value | (151,997) | (151,997) |
Operating Segments [Member] | Property and Casualty Insurance [Member] |  |  |
ASSETS: |  |  |
Cash and cash equivalents | 44,272 | 11,276 |
Reinsurance recoverables and trade receivables, net | 50,525 | 48,344 |
Inventories, net | 0 | 0 |
Prepaid expenses | 0 | 0 |
Investments, fixed maturities and marketable equities | 268,769 | 271,156 |
Investments, other | 115,583 | 125,130 |
Deferred policy acquisition costs, net | 0 | 0 |
Other assets | 800 | 730 |
Right of use Assets - Financing | 0 | 0 |
Right of use Assets - Operating | 785 | 914 |
Related Parties Amounts Due | 1,223 | 2,347 |
Subtotal assets | 481,957 | 459,897 |
Investments in subsidiaries | 0 | 0 |
Property, plant and equipment, at cost: |  |  |
Land | 0 | 0 |
Buildings and improvements | 0 | 0 |
Furniture and equipment | 0 | 0 |
Property, plant and equipment (gross) | 0 | 0 |
Less: Accumulated depreciation | 0 | 0 |
Total property, plant and equipment | 0 | 0 |
Total assets | 481,957 | 459,897 |
Liabilities: |  |  |
Accounts payable and accrued expenses | 4,472 | 4,470 |
Notes, loans and leases payable | 0 | 0 |
Operating lease liability | 800 | 928 |
Policy benefits and losses, claims and loss expenses payable | 150,148 | 153,007 |
Liabilities from investment contracts | 0 | 0 |
Other policyholders' funds and liabilities | 2,126 | 2,702 |
Deferred income | 0 | 0 |
Deferred income taxes, net | 3,973 | 1,713 |
Related party liabilities | 2,969 | 2,544 |
Total liabilities | 164,488 | 165,364 |
Stockholders' equity: |  |  |
Common stock, value, issued |  | 0 |
Additional paid-in capital | 91,120 | 91,120 |
Accumulated other comprehensive loss | (13,532) | (14,720) |
Retained earnings | 236,580 | 214,832 |
Total stockholders' equity | 317,469 | 294,533 |
Total liabilities and stockholders' equity | 481,957 | 459,897 |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Rental Trailers and Other Rental Equipment [Member] |  |  |
Property, plant and equipment, at cost: |  |  |
Property subject to or available for operating lease, gross | 0 | 0 |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Rental Trucks [Member] |  |  |
Property, plant and equipment, at cost: |  |  |
Property subject to or available for operating lease, gross | 0 | 0 |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Series A Preferred Stock [Member] |  |  |
Stockholders' equity: |  |  |
Preferred stock, value, issued | 0 | 0 |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Series B Preferred Stock [Member] |  |  |
Stockholders' equity: |  |  |
Preferred stock, value, issued | 0 | 0 |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Serial Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 0 | 0 |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Amerco Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 3,301 | 3,301 |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Nonvoting Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 0 |  |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Common Stock in Treasury [Member] |  |  |
Stockholders' equity: |  |  |
Treasury stock, value | 0 | 0 |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Preferred Stock in Treasury [Member] |  |  |
Stockholders' equity: |  |  |
Treasury stock, value | 0 | 0 |
Operating Segments [Member] | Life Insurance [Member] |  |  |
ASSETS: |  |  |
Cash and cash equivalents | 32,069 | 15,006 |
Reinsurance recoverables and trade receivables, net | 31,668 | 33,331 |
Inventories, net | 0 | 0 |
Prepaid expenses | 0 | 0 |
Investments, fixed maturities and marketable equities | 2,168,023 | 2,271,501 |
Investments, other | 511,238 | 427,096 |
Deferred policy acquisition costs, net | 121,365 | 128,463 |
Other assets | 5,302 | 3,884 |
Right of use Assets - Financing | 0 | 0 |
Right of use Assets - Operating | 153 | 25 |
Related Parties Amounts Due | 11,808 | 12,268 |
Subtotal assets | 2,881,626 | 2,891,574 |
Investments in subsidiaries | 0 | 0 |
Property, plant and equipment, at cost: |  |  |
Land | 0 | 0 |
Buildings and improvements | 0 | 0 |
Furniture and equipment | 0 | 0 |
Property, plant and equipment (gross) | 0 | 0 |
Less: Accumulated depreciation | 0 | 0 |
Total property, plant and equipment | 0 | 0 |
Total assets | 2,881,626 | 2,891,574 |
Liabilities: |  |  |
Accounts payable and accrued expenses | 7,910 | 26,890 |
Notes, loans and leases payable | 0 | 0 |
Operating lease liability | 153 | 27 |
Policy benefits and losses, claims and loss expenses payable | 390,607 | 391,968 |
Liabilities from investment contracts | 2,393,590 | 2,398,884 |
Other policyholders' funds and liabilities | 5,551 | 5,530 |
Deferred income | 0 | 0 |
Deferred income taxes, net | (74,585) | (77,615) |
Related party liabilities | 13,376 | 13,644 |
Total liabilities | 2,736,602 | 2,759,328 |
Stockholders' equity: |  |  |
Common stock, value, issued |  | 0 |
Additional paid-in capital | 26,271 | 26,271 |
Accumulated other comprehensive loss | (218,470) | (225,904) |
Retained earnings | 334,723 | 329,379 |
Total stockholders' equity | 145,024 | 132,246 |
Total liabilities and stockholders' equity | 2,881,626 | 2,891,574 |
Operating Segments [Member] | Life Insurance [Member] | Rental Trailers and Other Rental Equipment [Member] |  |  |
Property, plant and equipment, at cost: |  |  |
Property subject to or available for operating lease, gross | 0 | 0 |
Operating Segments [Member] | Life Insurance [Member] | Rental Trucks [Member] |  |  |
Property, plant and equipment, at cost: |  |  |
Property subject to or available for operating lease, gross | 0 | 0 |
Operating Segments [Member] | Life Insurance [Member] | Series A Preferred Stock [Member] |  |  |
Stockholders' equity: |  |  |
Preferred stock, value, issued | 0 | 0 |
Operating Segments [Member] | Life Insurance [Member] | Series B Preferred Stock [Member] |  |  |
Stockholders' equity: |  |  |
Preferred stock, value, issued | 0 | 0 |
Operating Segments [Member] | Life Insurance [Member] | Serial Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 0 | 0 |
Operating Segments [Member] | Life Insurance [Member] | Amerco Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 2,500 | 2,500 |
Operating Segments [Member] | Life Insurance [Member] | Nonvoting Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 0 |  |
Operating Segments [Member] | Life Insurance [Member] | Common Stock in Treasury [Member] |  |  |
Stockholders' equity: |  |  |
Treasury stock, value | 0 | 0 |
Operating Segments [Member] | Life Insurance [Member] | Preferred Stock in Treasury [Member] |  |  |
Stockholders' equity: |  |  |
Treasury stock, value | 0 | 0 |
Consolidation, Eliminations [Member] |  |  |
ASSETS: |  |  |
Cash and cash equivalents | 0 | 0 |
Reinsurance recoverables and trade receivables, net | 0 | 0 |
Inventories, net | 0 | 0 |
Prepaid expenses | 0 | 0 |
Investments, fixed maturities and marketable equities | 0 | 0 |
Investments, other | 0 | 0 |
Deferred policy acquisition costs, net | 0 | 0 |
Other assets | 0 | 0 |
Right of use Assets - Financing | 0 | 0 |
Right of use Assets - Operating | 0 | 0 |
Related Parties Amounts Due | (35,822) | (35,451) |
Subtotal assets | (35,822) | (35,451) |
Investments in subsidiaries | (462,493) | (426,779) |
Property, plant and equipment, at cost: |  |  |
Land | 0 | 0 |
Buildings and improvements | 0 | 0 |
Furniture and equipment | 0 | 0 |
Property, plant and equipment (gross) | 0 | 0 |
Less: Accumulated depreciation | 0 | 0 |
Total property, plant and equipment | 0 | 0 |
Total assets | (498,315) | (462,230) |
Liabilities: |  |  |
Accounts payable and accrued expenses | 0 | 0 |
Notes, loans and leases payable | 0 | 0 |
Operating lease liability | 0 | 0 |
Policy benefits and losses, claims and loss expenses payable | 0 | 0 |
Liabilities from investment contracts | 0 | 0 |
Other policyholders' funds and liabilities | 0 | 0 |
Deferred income | 0 | 0 |
Deferred income taxes, net | 0 | 0 |
Related party liabilities | (42,099) | (41,270) |
Total liabilities | (42,099) | (41,270) |
Stockholders' equity: |  |  |
Common stock, value, issued |  | 0 |
Additional paid-in capital | (117,601) | (117,601) |
Accumulated other comprehensive loss | 238,279 | 246,443 |
Retained earnings | (571,093) | (544,001) |
Total stockholders' equity | (456,216) | (420,960) |
Total liabilities and stockholders' equity | (498,315) | (462,230) |
Consolidation, Eliminations [Member] | Rental Trailers and Other Rental Equipment [Member] |  |  |
Property, plant and equipment, at cost: |  |  |
Property subject to or available for operating lease, gross | 0 | 0 |
Consolidation, Eliminations [Member] | Rental Trucks [Member] |  |  |
Property, plant and equipment, at cost: |  |  |
Property subject to or available for operating lease, gross | 0 | 0 |
Consolidation, Eliminations [Member] | Series A Preferred Stock [Member] |  |  |
Stockholders' equity: |  |  |
Preferred stock, value, issued | 0 | 0 |
Consolidation, Eliminations [Member] | Series B Preferred Stock [Member] |  |  |
Stockholders' equity: |  |  |
Preferred stock, value, issued | 0 | 0 |
Consolidation, Eliminations [Member] | Serial Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 0 | 0 |
Consolidation, Eliminations [Member] | Amerco Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | (5,801) | (5,801) |
Consolidation, Eliminations [Member] | Nonvoting Common Stock [Member] |  |  |
Stockholders' equity: |  |  |
Common stock, value, issued | 0 |  |
Consolidation, Eliminations [Member] | Common Stock in Treasury [Member] |  |  |
Stockholders' equity: |  |  |
Treasury stock, value | 0 | 0 |
Consolidation, Eliminations [Member] | Preferred Stock in Treasury [Member] |  |  |
Stockholders' equity: |  |  |
Treasury stock, value | $ 0 | $ 0 |

X
- Definition This extended concept is a combination of two concepts on the US-GAAP taxonomy. (1) Reinsurance Recoverables defined as..."The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance." (2) Receivables, Net, Current defined as..."The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowance established for the purpose of reducing such receivables to an amount that approximates their net realizable value" + References No definition available. + Details
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- Definition Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481372/852-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(18)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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