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Significant Accounting and Reporting Policies - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Significant Accounting Policies [Line Items] |  |  |
A maximum lag period of recognizing the results of subsidiaries and affiliates | 3 months |  |
Increase in additional paid-in capital had such stock splits made prior to October 1, 2001 | ¥ 24,674 |  |
Advance and/or progress payments for development of condominiums for sale | 111,813 | 34,556 |
Finished goods | 24,291 | 6,933 |
Write-down of advance and/or progress payments for development of residential condominiums | 5,650 | 3,377 | 4,039
Capitalized interest costs related to specific long-term development projects | 981 | 1,707 | 2,395
Advertising expense | 15,269 | 11,579 | 5,888
Investment in operating leases | Transportation equipment |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated average useful lives | 9 years |  |
Investment in operating leases | Measuring and information-related equipment |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated average useful lives | 4 years |  |
Investment in operating leases | Real Estate |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated average useful lives | 31 years |  |
Investment in operating leases | Property, Plant and Equipment, Other Types |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated average useful lives | 6 years |  |
Other Operating Assets |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciation expenses | 15,129 | 8,072 | 6,547
Accumulated depreciation | 62,182 | 48,313 |
Other Operating Assets | Property, Plant and Equipment, Other Types | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated average useful lives | 20 years |  |
Other Operating Assets | Buildings | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated average useful lives | 50 years |  |
Other Operating Assets | Land improvement | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated average useful lives | 60 years |  |
Office Facilities |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciation expenses | 3,494 | 2,994 | 3,228
Accumulated depreciation | ¥ 39,747 | ¥ 41,698 |
Office Facilities | Buildings and fixtures | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated average useful lives | 62 years |  |
Office Facilities | Machinery and equipment | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated average useful lives | 20 years |  |

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- Definition Maximum Lag Period of Recognizing the Results of Subsidiaries and Affiliates + References No definition available. + Details
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition Amount of decrease in additional paid in capital (APIC) resulting from a stock split in which per-share par value or stated value is not changed proportionately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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