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Discontinued Operations (Parenthetical) (Detail) (JPY ¥)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income from discontinued operations, aggregate gains and losses on sales and liquidation of subsidiaries, business units, and rental properties ¥ 1,980 ¥ 5,919 ¥ 3,900 ¥ 11,185