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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, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Allowance for doubtful accounts (deducted from trade receivable) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 535 | $ 549 | $ 496
Additions charged to cost and expenses | 2,179 | 731 | 1,550
Additions charged to other accounts | 2,680 | 0 | 0
Deductions | (973) | (745) | (1,497)
Balance at year end | 4,421 | 535 | 549
Allowance for obsolescence (deducted from inventory) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 3,063 | 2,322 | 5,329
Additions charged to cost and expenses | 0 | 741 | 0
Additions charged to other accounts | 0 | 0 | 0
Deductions | (1,647) | 0 | (3,007)
Balance at year end | 1,416 | 3,063 | 2,322
Allowance for LIFO (deducted from inventory) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 18,886 | 18,987 | 16,126
Additions charged to cost and expenses | 2,946 | 0 | 2,861
Additions charged to other accounts | 0 | 0 | 0
Deductions | 0 | (101) | 0
Balance at year end | 21,832 | 18,886 | 18,987
Allowance for probable losses (deducted from mortgage loans) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 493 | 493 | 618
Additions charged to cost and expenses | 0 | 0 | 0
Additions charged to other accounts | 0 | 0 | 0
Deductions | (45) | 0 | (125)
Balance at year end | $ 448 | $ 493 | $ 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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