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Available-for-Sale Investments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Mar. 31, 2014
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Available-for-sale securities, investments: |  |
Amortized cost | $ 1,179,977 | $ 1,135,544
Gross unrealized gains | 51,825 | 39,491
Gross unrealized losses more than 12 months | (5,983) | (4,192)
Gross unrealized losses less than 12 months | (12,507) | (32,568)
Estimated market value | 1,213,312 | 1,138,275
U.S. treasury securities and government obligations [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 48,959 | 49,883
Gross unrealized gains | 2,405 | 1,475
Gross unrealized losses more than 12 months | (261) |
Gross unrealized losses less than 12 months | (83) | (1,004)
Estimated market value | 51,020 | 50,354
U.S. government agency mortgage-backed securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 34,679 | 36,258
Gross unrealized gains | 2,754 | 2,558
Gross unrealized losses more than 12 months | (332) | (4)
Gross unrealized losses less than 12 months | (18) | (425)
Estimated market value | 37,083 | 38,387
Obligations of states and political subdivisions [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 167,039 | 166,311
Gross unrealized gains | 7,955 | 4,834
Gross unrealized losses more than 12 months | (358) | (308)
Gross unrealized losses less than 12 months | (1,607) | (3,627)
Estimated market value | 173,029 | 167,210
Corporate securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 877,948 | 834,923
Gross unrealized gains | 34,019 | 26,075
Gross unrealized losses more than 12 months | (5,028) | (3,794)
Gross unrealized losses less than 12 months | (9,838) | (25,875)
Estimated market value | 897,101 | 831,329
Mortgage-backed securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 15,335 | 12,425
Gross unrealized gains | 296 | 279
Gross unrealized losses more than 12 months | (2) | (3)
Gross unrealized losses less than 12 months | (272) | (514)
Estimated market value | 15,357 | 12,187
Redeemable preferred stocks [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 17,447 | 18,445
Gross unrealized gains | 426 | 283
Gross unrealized losses more than 12 months |  | (82)
Gross unrealized losses less than 12 months | (669) | (1,113)
Estimated market value | 17,204 | 17,533
Common stocks [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 18,570 | 17,299
Gross unrealized gains | 3,970 | 3,987
Gross unrealized losses more than 12 months | (2) | (1)
Gross unrealized losses less than 12 months | (20) | (10)
Estimated market value | $ 22,518 | $ 21,275

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- Definition We used "AvailableForSaleSecuritiesGrossUnrealizedGainLoss" in prior filings for this concept, but the 2013 taxonomy deprecated the above concept and created a new one with the period type changed to 'duration.' We must have an 'instant' period type in order to complete the calculation within this schedule. This is the unrealized gain on all our available-for-sale investments as of the quarter ending date. + References No definition available. + Details
Name: | uhal_GrossUnrealizedGains
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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