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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, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Allowance for doubtful accounts (deducted from trade receivable) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 549 | $ 496 | $ 585
Additions charged to cost and expenses | 731 | 1,550 | 886
Additions charged to other accounts | 0 | 0 | 0
Deductions | (745) | (1,497) | (929)
Balance at year end | 535 | 549 | 496
Allowance for obsolescence (deducted from inventory) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 2,322 | 5,329 | 2,050
Additions charged to cost and expenses | 741 | 0 | 3,279
Additions charged to other accounts | 0 | 0 | 0
Deductions | 0 | (3,007) | 0
Balance at year end | 3,063 | 2,322 | 5,329
Allowance for LIFO (deducted from inventory) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 18,987 | 16,126 | 14,340
Additions charged to cost and expenses | 0 | 2,861 | 1,786
Additions charged to other accounts | 0 | 0 | 0
Deductions | (101) | 0 | 0
Balance at year end | 18,886 | 18,987 | 16,126
Allowance for probable losses (deducted from mortgage loans) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 493 | 618 | 493
Additions charged to cost and expenses | 0 | 0 | 125
Additions charged to other accounts | 0 | 0 | 0
Deductions | 0 | (125) | 0
Balance at year end | $ 493 | $ 493 | $ 618

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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) -URI http://asc.fasb.org/extlink&oid=26873400&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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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