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Condensed Financial Information of AMERCO, Statements of Cash Flow (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Cash flow from operating activities: |  |  |
Net earnings | $ 264,708 | $ 205,367 | $ 183,575
Adjustments to reconcile net earnings to cash provided by operations: |  |  |
Depreciation | 260,492 | 229,789 | 212,324
Net (gain) loss on sale of investments | (8,323) | (5,579) | (1,135)
Deferred Income Taxes and Tax Credits | 13,518 | 104,360 | 80,898
Net change in other operating assets and liabilities: |  |  |
Prepaid expenses | (15,587) | 15,748 | (4,244)
Other assets | 21,556 | 5,992 | 28,715
Related party assets | 133,672 | (14,210) | (87)
Accounts payable and accrued expenses | 40,032 | 19,469 | 12,547
Net cash provided by operating activities | 661,530 | 669,842 | 572,863
Cash flow from investing activities: |  |  |
Purchases of property, plant and equipment | (655,984) | (589,799) | (480,418)
Purchases of equity securities | (16,289) | (9,048) | (11,550)
Proceeds of equity securities | 372 | 10,222 | 1,198
Net cash used by investing activities | (712,213) | (582,137) | (373,970)
Cash flow from financing activities: |  |  |
Preferred stock redemption paid | 0 | (144,289) | 0
Preferred stock dividends paid | 0 | (2,913) | (12,412)
Common stock dividends paid | (97,421) | (19,484) | 0
Contribution to related party | 0 | (518) | 0
Net cash used by financing activities | 157,783 | (112,745) | (60,768)
Increase (decrease) in cash and cash equivalents | 106,564 | (25,334) | 138,396
Cash and cash equivalents at the beginning of period | 357,180 | 382,514 | 244,118
Cash and cash equivalents at the end of the period | 463,744 | 357,180 | 382,514
AMERCO |  |  |
Cash flow from operating activities: |  |  |
Net earnings | 264,708 | 205,695 | 184,126
Change in investments in subsidiaries | (212,164) | (149,160) | (132,570)
Adjustments to reconcile net earnings to cash provided by operations: |  |  |
Depreciation | 5 | 5 | 9
Net (gain) loss on sale of investments | (76) | (488) | (65)
Deferred Income Taxes and Tax Credits | 9,206 | 109,680 | 73,790
Net change in other operating assets and liabilities: |  |  |
Prepaid expenses | (12,979) | 6,470 | (15,966)
Other assets | 365 | 2,380 | 34,937
Related party assets | 0 | 0 | 273
Accounts payable and accrued expenses | 2,659 | 4,163 | (8,603)
Net cash provided by operating activities | 51,724 | 178,745 | 135,931
Cash flow from investing activities: |  |  |
Purchases of property, plant and equipment | (2) | (1) | (5)
Purchases of equity securities | 0 | (8,855) | (8,253)
Proceeds of equity securities | 372 | 8,800 | 1,065
Net cash used by investing activities | 370 | (56) | (7,193)
Cash flow from financing activities: |  |  |
Proceeds from (repayment of) intercompany loans | 172,444 | (52,051) | 30,566
Preferred stock redemption paid |  | (151,997) |
Preferred stock dividends paid |  | (3,241) | (12,963)
Common stock dividends paid | (97,421) | (19,484) |
Dividend from related party |  |  | 3,303
Contribution to related party | (1,500) | (518) |
Net cash used by financing activities | 73,523 | (227,291) | 20,906
Increase (decrease) in cash and cash equivalents | 125,617 | (48,602) | 149,644
Cash and cash equivalents at the beginning of period | 201,502 | 250,104 | 100,460
Cash and cash equivalents at the end of the period | $ 327,119 | $ 201,502 | $ 250,104

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- Definition The cash outflow for reacquisition of callable preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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- Definition Cash outflow in the form of ordinary dividends to common shareholders, generally out of earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Cash inflows (outflows) from issuing and redeeming redeemable preferred stock; includes convertible and nonconvertible redeemable preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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