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Discontinued Operations - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gains (losses) on sales of subsidiaries and liquidation losses, net   ¥ (13) ¥ (361)
Gains losses on derivative trading instruments included in income from subsidiary   (370) (1,188)
Loss on Liquidating Subsidiary 14,600 6,789 3,609
Other Operating Assets 312,774 233,258  
Other Receivables 239,958 196,626  
Other Assets 1,041,356 475,466  
Gains on sales of real estate properties 17,820 14,032 14,721
Rental properties held for sale 44,694 39,459  
Segment, Discontinued Operations
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gains (losses) on sales of subsidiaries and liquidation losses, net 333 175  
Other Operating Assets 1,561    
Other Receivables 2,069    
Other Assets 1,500    
Current Liabilities 1,822    
Long Term Liabilities 1,336    
Real Estate
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gains on sales of real estate properties 16,200 6,802 4,921
Subsidiaries
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss on Liquidating Subsidiary ¥ 1,600