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Schedule II, AMERCO and Consolidated Subsidiaries, Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Allowance for doubtful accounts (deducted from trade receivable) |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 1,128 | $ 1,336 | $ 1,308
Additions charged to cost and expenses | 1,184 | 1,485 | 2,611
Additions charged to other accounts | 0 | 0 | 0
Deductions | (1,318) | (1,693) | (2,583)
Valuation allowances and reserves, period increase (decrease) | (134) | (208) | 28
Balance at year end | 994 | 1,128 | 1,336
Allowance for obsolescence (deducted from inventory) |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 730 | 595 | 2,600
Additions charged to cost and expenses | 981 | 135 | 0
Additions charged to other accounts | 0 | 0 | 0
Deductions | 0 | 0 | (2,005)
Valuation allowances and reserves, period increase (decrease) | 981 | 135 | (2,005)
Balance at year end | 1,711 | 730 | 595
Allowance for probable losses (deducted from mortgage loans) |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 370 | 370 | 370
Additions charged to cost and expenses | 0 | 0 | 0
Additions charged to other accounts | 0 | 0 | 0
Deductions | 0 | 0 | 0
Valuation allowances and reserves, period increase (decrease) | 0 | 0 | 0
Balance at year end | $ 370 | $ 370 | $ 370

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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