Marketable Securities and Securities Investments (Details Textual) (JPY ¥) In Millions	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Marketable Securities and Securities Investments (Textuals) [Abstract]
Proceeds from sale of available-for-sale securities	¥ 532,619	¥ 785,698	¥ 1,165,451
Gross realized gains from available for sale securities	38,654	39,622	41,860
Gross realized loss from available for sale securities	2,014	37,537	30,554
Marketable securities classified as trading securities	375,802	353,353
Investment Holdings Other Than Securities [Line Items]
Net unrealized losses on trading securities	10,768		79,476
Net unrealized gains on trading securities		50,992
Total realized impairment losses on marketable securities	9,763	5,508	45,644
Private equity [Member]
Investment Holdings Other Than Securities [Line Items]
Investments	¥ 67,376	¥ 70,705

Marketable securities and securities investments.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 21
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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Sum of the carrying amounts as of the balance sheet date of current and noncurrent investments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
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-Subparagraph h
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This element represents the amount of loss recognized for other than temporary impairments of investments in debt and equity securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time, usually less than one year or the normal operating cycle, whichever is longer) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition; this is the reason why the trading category of investments in debt and equity securities are bought and sold "principally" for sale in the near term. Transfers into and out of the trading category should be rare. Such financial instruments that are held as of the reporting date are measured at fair value with unrealized holding gains and losses (the difference between fair value and the previously reported carrying amount) included in earnings.

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For trading securities held as of the balance sheet date, this amount represents the excess fair value of trading securities over their carrying value (unrealized holding gain). Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and such unrealized holding gain is included in earnings for the period.

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For trading securities held as of the balance sheet date, this amount represents the excess carrying value of trading securities over their fair value (unrealized holding loss). Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and such unrealized holding loss is included in earnings for the period.

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