Stockholders' Equity (Detail) (JPY ¥) In Millions, except Share data, unless otherwise specified	12 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Stockholders' Equity [Line Items]
Treasury stock acquired, shares	635,123	327,193	53,863
Treasury stock reissued, shares	242,043,928	15,100	17,731
Treasury stock decreased		¥ 424,010
Capital and legal reserves appropriations, percentage	10.00%
Capital and legal reserves equal to stated capital, percent	25.00%
Cash dividends per share	¥ 10.00	¥ 10.00	¥ 12.50
Board approved dividends per share	¥ 5.0
Board approved dividends	11,559
Retained earnings restricted as to payment of cash dividends	¥ 247,277
Pew And Sanyo [Member]
Stockholders' Equity [Line Items]
Treasury stock reissued, shares		241,961,655

Capital And Legal Reserves Appropriations

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Capital And Legal Reserves Equal To Stated Capital

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Change in Treasury Stock in Connection with Share Exchange Transaction

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Aggregate dividends paid during the period for each share of common stock outstanding.

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-Publisher SEC

-Name Regulation S-X (SX)

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The aggregate amount of dividends declared, but not paid, as of the financial reporting date.

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-Name Statement of Financial Accounting Standard (FAS)

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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A segregation of retained earnings which is available for dividend distribution. Earnings not paid out as dividends but instead reinvested in the core business or used to pay off debt. Unappropriated profit is part of shareholder equity. Also called cumulative distributions or earned surplus or accumulated earnings or unappropriated profit.

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Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Number of shares that have been repurchased during the period and are being held in treasury.

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