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Discontinued Operations (Parenthetical) (Detail)
In Millions
12 Months Ended
Mar. 31, 2011
USD ($)
Mar. 31, 2011
JPY (¥)
Mar. 31, 2010
JPY (¥)
Mar. 31, 2009
JPY (¥)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income from discontinued operations, aggregate gains on sales of subsidiaries, business units, and rental properties $ 173 ¥ 14,393 ¥ 14,056 ¥ 19,653