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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, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Allowance for doubtful accounts (deducted from trade receivable) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 496 | $ 539 | $ 585
Additions charged to cost and expenses | 1,550 | 886 | 913
Additions charged to other accounts |  |  |
Deductions | (1,497) | (929) | (959)
Balance at year end | 549 | 496 | 539
Allowance for obsolescence (deducted from inventory) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 5,329 | 2,050 | 1,597
Additions charged to cost and expenses |  | 3,279 | 1,218
Additions charged to other accounts |  |  |
Deductions | (3,007) |  | (765)
Balance at year end | 2,322 | 5,329 | 2,050
Allowance for LIFO (deducted from inventory) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 16,126 | 14,340 | 13,463
Additions charged to cost and expenses | 2,861 | 1,786 | 877
Additions charged to other accounts |  |  |
Deductions |  |  |
Balance at year end | 18,987 | 16,126 | 14,340
Allowance for probable losses (deducted from mortgage loans) [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 618 | 493 | 368
Additions charged to cost and expenses |  | 125 | 125
Additions charged to other accounts |  |  |
Deductions | (125) |  |
Balance at year end | $ 493 | $ 618 | $ 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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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