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Write-Downs of Long-Lived Assets - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses ¥ 26,742 ¥ 21,053 ¥ 20,246
Write-downs of long-lived assets 23,421 17,896 15,167
Office Building
      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses 3,582 923 605
Number of impaired assets 2 2 3
Impairment loss due to change in use 4,109    
Office Building Held for Sale
      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses 1,445 1,055 1,055
Number of impaired assets 5 14 17
Condominiums Held for Sale
      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses 988 1,142 1,108
Number of impaired assets 1 13 25
Condominiums
      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses   3,853 269
Number of impaired assets   4 5
Commercial Facilities Other Than Office Buildings
      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses 2,976 1,582  
Number of impaired assets 2 2  
Commercial Facilities Other Than Office Buildings Held for Sale
      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses 137 442 385
Number of impaired assets 1 4 7
Land Undeveloped Or Under Construction Held for Sale
      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses 713 608 2,220
Land Undeveloped Or Under Construction
      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses 3,787 6,818 6,983
Property, Plant and Equipment, Other Types
      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses 9,005 4,630 7,621
Building used for training facility in facilities operation business
      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses 5,052    
Information-related equipment in rental operation
      
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment losses ¥ 1,292