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Fair Value Measurements - Additional Information (Detail) (Corporate debt securities, JPY ¥) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2012
Corporate debt securities |
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items] |
Corporate debt securities transferred from Level 2 to Level 3 | ¥ 468

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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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