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Changes in Goodwill by Reportable Segment (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Goodwill [Line Items]      
Goodwill ¥ 126,625 ¥ 96,107 ¥ 97,397
Accumulated impairment losses (296) (296) (2,607)
Beginning Balance 126,329 95,811 94,790
Acquired 214,713 24,114 4,024
Impairment 0 0 0
Other (net) 25,333 [1] 6,404 [1] (3,003) [1]
Goodwill 366,671 126,625 96,107
Accumulated impairment losses (296) (296) (296)
Ending Balance 366,375 126,329 95,811
Corporate Financial Services
      
Goodwill [Line Items]      
Goodwill 754 754 547
Accumulated impairment losses (257) (257) (430)
Beginning Balance 497 497 117
Acquired 550 0 380
Impairment 0 0 0
Other (net) 0 [1] 0 [1] 0 [1]
Goodwill 1,304 754 754
Accumulated impairment losses (257) (257) (257)
Ending Balance 1,047 497 497
Maintenance Leasing
      
Goodwill [Line Items]      
Goodwill 282 282 282
Accumulated impairment losses 0 0 0
Beginning Balance 282 282 282
Acquired 0 0 0
Impairment 0 0 0
Other (net) 0 [1] 0 [1] 0 [1]
Goodwill 282 282 282
Accumulated impairment losses 0 0 0
Ending Balance 282 282 282
Real Estate
      
Goodwill [Line Items]      
Goodwill 19,329 19,063 19,047
Accumulated impairment losses 0 0 0
Beginning Balance 19,329 19,063 19,047
Acquired 0 199 44
Impairment 0 0 0
Other (net) (29) [1] 67 [1] (28) [1]
Goodwill 19,300 19,329 19,063
Accumulated impairment losses 0 0 0
Ending Balance 19,300 19,329 19,063
Investment and Operation
      
Goodwill [Line Items]      
Goodwill 11,751 312 3,674
Accumulated impairment losses (39) (39) (2,177)
Beginning Balance 11,712 273 1,497
Acquired 44,856 11,439 14
Impairment 0 0 0
Other (net) 111 [1] 0 [1] (1,238) [1]
Goodwill 56,718 11,751 312
Accumulated impairment losses (39) (39) (39)
Ending Balance 56,679 11,712 273
Retail
      
Goodwill [Line Items]      
Goodwill 15,424 4,452 4,452
Accumulated impairment losses 0 0 0
Beginning Balance 15,424 4,452 4,452
Acquired 0 10,972 0
Impairment 0 0 0
Other (net) 0 [1] 0 [1] 0 [1]
Goodwill 15,424 15,424 4,452
Accumulated impairment losses 0 0 0
Ending Balance 15,424 15,424 4,452
Overseas
      
Goodwill [Line Items]      
Goodwill 79,085 71,244 69,395
Accumulated impairment losses 0 0 0
Beginning Balance 79,085 71,244 69,395
Acquired 169,307 1,504 3,586
Impairment 0 0 0
Other (net) 25,251 [1] 6,337 [1] (1,737) [1]
Goodwill 273,643 79,085 71,244
Accumulated impairment losses 0 0 0
Ending Balance ¥ 273,643 ¥ 79,085 ¥ 71,244
[1] Other includes foreign currency translation adjustments and certain other reclassifications.