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Discontinued Operations - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Subsidiaries
Jun. 30, 2011
Subsidiaries
Dec. 31, 2010
Subsidiaries
Sep. 30, 2010
Subsidiaries
Dec. 31, 2011
Real Estate
Dec. 31, 2010
Real Estate
Dec. 31, 2011
Real Estate
Dec. 31, 2010
Real Estate
Mar. 31, 2011
Real Estate
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Gain on sales of subsidiaries and business units ¥ 1,980 ¥ 5,919 ¥ 3,900 ¥ 11,185 ¥ 377 ¥ 162 ¥ 5,896 ¥ 263          
Gain (loss) on liquidation of subsidiaries and business units         (37)   33            
Gains (losses) on sales of real estate properties                 1,640 (10) 3,398 4,993  
Rental properties held for sale                 ¥ 22,820   ¥ 22,820   ¥ 27,486