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Acquisitions - Additional Information (Detail) (JPY ¥) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended |  |  |  |  |  |  |
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011 | Jul. 01, 2013 Robeco Groep N. V. | Mar. 31, 2014 Robeco Groep N. V. | Mar. 31, 2014 Robeco Groep N. V. Other operating revenues | Mar. 31, 2014 Series of Individually Immaterial Business Acquisitions | Mar. 31, 2013 Series of Individually Immaterial Business Acquisitions | Mar. 31, 2012 Series of Individually Immaterial Business Acquisitions | Feb. 27, 2014 DAIKYO | Mar. 31, 2014 DAIKYO | Mar. 31, 2005 DAIKYO | Mar. 31, 2005 DAIKYO Type-1 preferred stock | Mar. 31, 2005 DAIKYO Type-2 preferred stock | Mar. 31, 2005 DAIKYO Type-4 preferred stock | Mar. 31, 2009 DAIKYO Type-7 preferred stock | Mar. 31, 2009 DAIKYO Type-8 preferred stock | Mar. 31, 2013 Scenario, Previously Reported Series of Individually Immaterial Business Acquisitions | Mar. 31, 2012 Scenario, Previously Reported Series of Individually Immaterial Business Acquisitions | Mar. 31, 2013 Scenario, Adjustment Series of Individually Immaterial Business Acquisitions | Mar. 31, 2012 Scenario, Adjustment Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  | 51.00% |  |  | 90.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total acquisition consideration |  |  |  |  | ¥ 255,900 | ¥ 255,900 |  |  |  |  |  | ¥ 124,606 |  |  |  |  |  |  |  |  |  |
Consideration transferred for acquired interest |  |  |  |  | 250,724.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition, cost of acquired entity paid in cash |  |  |  |  | 231,316 |  |  | 62,565 | 70,537 | 11,964 |  |  |  |  |  |  |  |  |  |  |  |
Other transfer to acquire interest |  |  |  |  | 19,408 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued for acquired interest |  |  |  |  | 13,902,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares price for acquired interest |  |  |  |  | ¥ 1,396 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  |  | 5,176 | 2,833 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration remeasuresment reduction |  |  |  |  |  |  | 2,343 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  | 2,039 |  |  |  |  |  | 23 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 366,375 | 126,329 | 95,811 | 94,790 |  | 131,780 |  | 39,507 |  |  |  |  |  |  |  |  |  |  | 34,429 | 4,024 | 24,114 | 3,478
Acquired intangible assets other than goodwill |  |  |  |  |  | 205,730 |  | 1,343 |  |  |  |  |  |  |  |  |  |  | 14,491 | 0 | 29,090 | 2,476
Revenues | 1,341,651 | 1,055,764 | 964,779 |  |  | 111,027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | 186,490 | 118,890 | 82,907 |  |  | 17,251 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock shares acquired in business acquisition |  |  |  |  |  |  |  |  |  |  | 398,204,999 |  | 133,720,000 |  |  |  |  |  |  |  |  |
Number of preferred stock shares acquired in business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 | 15,000,000 | 25,000,000 | 25,000,000 | 23,598,144 |  |  |  |
Percentage of ownership interest before the acquisition |  |  |  |  |  |  |  |  |  |  | 31.70% |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest after the acquisition |  |  |  |  |  |  |  |  |  |  | 64.10% |  |  |  |  |  |  |  |  |  |  |
Business combination, step acquisition, equity interest in acquiree, fair value |  |  |  |  |  |  |  |  |  |  | 124,606 |  |  |  |  |  |  |  |  |  |  |
Business combination, step acquisition, equity interest in acquiree, remeasurement gain |  |  |  |  |  |  |  |  |  |  | 58,435 |  |  |  |  |  |  |  |  |  |  |
Goodwill and other intangible assets |  |  |  |  |  |  |  |  |  |  |  | 43,426 |  |  |  |  |  |  |  |  |  |
Goodwill Available For Tax Deductions |  |  |  |  |  |  |  | ¥ 1,184 | ¥ 6,964 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, including Goodwill + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date. + References No definition available. + Details
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- Definition Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination. + References No definition available. + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: 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 2: 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=31042434&loc=d3e3213-108585 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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