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Schedule II - AMERCO and Consolidated Subsidiaries, Valuation and Qualifying Accounts (Details) - Amerco [Member] - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Allowance for doubtful accounts (deducted from trade receivable) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 4,421 | $ 535 | $ 549
Additions charged to cost and expenses | 5,283 | 2,179 | 731
Additions charged to other accounts | 1,679 | 2,680 | 0
Deductions | (2,734) | (973) | (745)
Balance at year end | 8,649 | 4,421 | 535
Allowance for obsolescence (deducted from inventory) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 1,416 | 3,063 | 2,322
Additions charged to cost and expenses | 0 | 0 | 741
Additions charged to other accounts | 0 | 0 | 0
Deductions | (336) | (1,647) | 0
Balance at year end | 1,080 | 1,416 | 3,063
Allowance for LIFO (deducted from inventory) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 21,832 | 18,886 | 18,987
Additions charged to cost and expenses | 15,568 | 2,946 | 0
Additions charged to other accounts | 0 | 0 | 0
Deductions | 0 | 0 | (101)
Balance at year end | 37,400 | 21,832 | 18,886
Allowance for probable losses (deducted from mortgage loans) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 448 | 493 | 493
Additions charged to cost and expenses | 0 | 0 | 0
Additions charged to other accounts | 0 | 0 | 0
Deductions | 0 | (45) | 0
Balance at year end | $ 448 | $ 448 | $ 493

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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