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Other Operating Revenues and Other Operating Expenses (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Other operating revenues ¥ 491,313 ¥ 315,691 ¥ 250,679
Other operating expenses 310,775 194,693 152,521
Vehicle Maintenance and Management Services
      
Other operating revenues 46,433 45,654 45,150
Other operating expenses 32,915 33,336 35,026
M & A Advisory Services, Financing Advice, Financial Restructuring Advisory Services and Related Services
      
Other operating revenues 58,892 42,556 37,513
Private Equity Investment
      
Other operating revenues 134,444 32,681  
Other operating expenses 118,112 28,607  
Environment and Energy Related Business
      
Other operating revenues 51,441 29,812 21,202
Facilities Management of Golf Courses
      
Other operating revenues 24,229 23,479 23,061
Other operating expenses 20,749 21,130 20,418
Facilities Management of Hotels and Japanese Inns
      
Other operating revenues 36,825 31,093 29,355
Other operating expenses 32,822 26,959 26,038
Other Segment
      
Other operating revenues 139,049 110,416 94,398
Other operating expenses 64,320 61,519 52,983
Energy Related Businesses
      
Other operating expenses ¥ 41,857 ¥ 23,142 ¥ 18,056