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Write-Downs of Long-Lived Assets - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses | ¥ 26,742 | ¥ 21,053 | ¥ 20,246
Write-downs of long-lived assets | 23,421 | 17,896 | 15,167
Office Building |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses | 3,582 | 923 | 605
Number of impaired assets | 2 | 2 | 3
Impairment loss due to change in use | 4,109 |  |
Office Building Held for Sale |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses | 1,445 | 1,055 | 1,055
Number of impaired assets | 5 | 14 | 17
Condominiums Held for Sale |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses | 988 | 1,142 | 1,108
Number of impaired assets | 1 | 13 | 25
Condominiums |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses |  | 3,853 | 269
Number of impaired assets |  | 4 | 5
Commercial Facilities Other Than Office Buildings |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses | 2,976 | 1,582 |
Number of impaired assets | 2 | 2 |
Commercial Facilities Other Than Office Buildings Held for Sale |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses | 137 | 442 | 385
Number of impaired assets | 1 | 4 | 7
Land Undeveloped Or Under Construction Held for Sale |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses | 713 | 608 | 2,220
Land Undeveloped Or Under Construction |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses | 3,787 | 6,818 | 6,983
Property, Plant and Equipment, Other Types |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses | 9,005 | 4,630 | 7,621
Building used for training facility in facilities operation business |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses | 5,052 |  |
Information-related equipment in rental operation |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment losses | ¥ 1,292 |  |

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- Definition Number of Impaired Assets + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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