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Write-Downs of Long-Lived Assets - Additional Information (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
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses ¥ 12,573 ¥ 1,972 ¥ 15,531 ¥ 6,384
Write-downs of long-lived assets 9,582 994 11,482 4,719
Corporate Financial Services
        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses 793   793 104
Real Estate
        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses 10,928 1,218 12,928 4,334
Investment and Operation
        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses 66 417 286 935
Office Building
        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses   25   159
Number of impaired assets       3
Office Building Held For Sale
        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses 366 54 967 54
Number of impaired assets 4   13  
Commercial Facilities Other Than Office
        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses 214 918 248 1,702
Number of impaired assets 3 3 5 7
Condominiums Held for Sale
        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses 282 66 738 1,294
Number of impaired assets 6 4 21 24
Condominiums
        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses   689   1,328
Number of impaired assets   7   15
Land and buildings undeveloped or under construction held for sale
        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses 2,077   2,077  
Land and buildings undeveloped or under construction
        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses 6,631   6,631  
Property, Plant and Equipment, Other Types
        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment losses ¥ 3,003 ¥ 220 ¥ 4,870 ¥ 1,847