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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.

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