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Related Party Transations (Table Text Block) | 9 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Related Party Revenue [Abstract] |  |
Related Party Revenue |
|  | Quarter ended December 31, |
|  | 2024 |  |  | 2023 |
|  | (Unaudited) |
|  | (In thousands) |
U-Haul management fee revenue from Blackwater |  | $ | 7,193 |  |  | $ | 7,135 |
U-Haul management fee revenue from Mercury |  |  | 1,676 |  |  |  | 3,003 |
|  | $ | 8,869 |  |  | $ | 10,138 |
|  | Nine months ended December 31, |
|  | 2024 |  |  | 2023 |
|  | (Unaudited) |
|  | (In thousands) |
U-Haul management fee revenue from Blackwater |  | $ | 22,713 |  |  | $ | 22,585 |
U-Haul management fee revenue from Mercury |  |  | 5,237 |  |  |  | 5,997 |
|  | $ | 27,950 |  |  | $ | 28,582 |
|  | Quarter ended December 31, |
|  | 2024 |  |  | 2023 |
|  | (Unaudited) |
|  | (In thousands) |
U-Haul management fee revenue from Blackwater |  | $ | 7,193 |  |  | $ | 7,135 |
U-Haul management fee revenue from Mercury |  |  | 1,676 |  |  |  | 3,003 |
|  | $ | 8,869 |  |  | $ | 10,138 |
|  | Nine months ended December 31, |
|  | 2024 |  |  | 2023 |
|  | (Unaudited) |
|  | (In thousands) |
U-Haul management fee revenue from Blackwater |  | $ | 22,713 |  |  | $ | 22,585 |
U-Haul management fee revenue from Mercury |  |  | 5,237 |  |  |  | 5,997 |
|  | $ | 27,950 |  |  | $ | 28,582 |
Related Party costs and expenses |
|  | Quarter ended December 31, |
|  | 2024 |  |  | 2023 |
|  | (Unaudited) |
|  | (In thousands) |
U-Haul lease expenses to Blackwater |  | $ | 604 |  |  | $ | 604 |
U-Haul printing expenses to Blackwater |  |  | 1,176 |  |  |  | 877 |
U-Haul commission expenses to Blackwater |  |  | 19,409 |  |  |  | 18,946 |
U-Haul lease expenses to Mercury |  |  | 38 |  |  |  | — |
U-Haul commission expenses to Mercury |  |  | 5,304 |  |  |  | — |
|  | $ | 26,531 |  |  | $ | 20,427 |
|  | Nine months ended December 31, |
|  | 2024 |  |  | 2023 |
|  | (Unaudited) |
|  | (In thousands) |
U-Haul lease expenses to Blackwater |  | $ | 1,812 |  |  | $ | 1,812 |
U-Haul printing expenses to Blackwater |  |  | 3,734 |  |  |  | 2,194 |
U-Haul commission expenses to Blackwater |  |  | 66,538 |  |  |  | 65,684 |
U-Haul lease expenses to Mercury |  |  | 114 |  |  |  | — |
U-Haul commission expenses to Mercury |  |  | 17,755 |  |  |  | — |
|  | $ | 89,953 |  |  | $ | 69,690 |
|  | Quarter ended December 31, |
|  | 2024 |  |  | 2023 |
|  | (Unaudited) |
|  | (In thousands) |
U-Haul lease expenses to Blackwater |  | $ | 604 |  |  | $ | 604 |
U-Haul printing expenses to Blackwater |  |  | 1,176 |  |  |  | 877 |
U-Haul commission expenses to Blackwater |  |  | 19,409 |  |  |  | 18,946 |
U-Haul lease expenses to Mercury |  |  | 38 |  |  |  | — |
U-Haul commission expenses to Mercury |  |  | 5,304 |  |  |  | — |
|  | $ | 26,531 |  |  | $ | 20,427 |
|  | Nine months ended December 31, |
|  | 2024 |  |  | 2023 |
|  | (Unaudited) |
|  | (In thousands) |
U-Haul lease expenses to Blackwater |  | $ | 1,812 |  |  | $ | 1,812 |
U-Haul printing expenses to Blackwater |  |  | 3,734 |  |  |  | 2,194 |
U-Haul commission expenses to Blackwater |  |  | 66,538 |  |  |  | 65,684 |
U-Haul lease expenses to Mercury |  |  | 114 |  |  |  | — |
U-Haul commission expenses to Mercury |  |  | 17,755 |  |  |  | — |
|  | $ | 89,953 |  |  | $ | 69,690 |
Related party assets |
|  | December 31, |  |  | March 31, |
|  | 2024 |  |  | 2024 |
|  | (Unaudited) |
|  | (In thousands) |
U-Haul receivable from Blackwater |  | $ | 40,323 |  |  | $ | 31,950 |
U-Haul receivable from Mercury |  |  | 18,604 |  |  |  | 24,536 |
Other (a) |  |  | (879 | ) |  |  | 1,448 |
|  | $ | 58,048 |  |  | $ | 57,934 |
(a) Timing differences for intercompany receivables and payables with insurance subsidiaries resulting from the three-month difference in reporting periods. |

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- Definition The Company has not provided financial or other support explicitly or implicitly during the period ended to any of these entities that it was not previously contractually required to provide. The carrying amount and the classification of assets and liabilities in the Company's balance sheet that related to the Company's variable interest in the Blackwater's entities are noted here, which approximate the maximum exposure to loss as a result of the Company's involvement with these entities. + References No definition available. + Details
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- Definition Related Party Revenue Abstract + References No definition available. + Details
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- Definition Tabular disclosure of each detailed component of other operating costs and expenses that are applicable to sales and revenues, but not included in the cost of sales in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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