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Discontinued Operations - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gains (losses) on sales of subsidiaries and liquidation losses, net |  | ¥ (13) | ¥ (361)
Gains losses on derivative trading instruments included in income from subsidiary |  | (370) | (1,188)
Loss on Liquidating Subsidiary | 14,600 | 6,789 | 3,609
Other Operating Assets | 312,774 | 233,258 |
Other Receivables | 239,958 | 196,626 |
Other Assets | 1,041,356 | 475,466 |
Gains on sales of real estate properties | 17,820 | 14,032 | 14,721
Rental properties held for sale | 44,694 | 39,459 |
Segment, Discontinued Operations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gains (losses) on sales of subsidiaries and liquidation losses, net | 333 | 175 |
Other Operating Assets | 1,561 |  |
Other Receivables | 2,069 |  |
Other Assets | 1,500 |  |
Current Liabilities | 1,822 |  |
Long Term Liabilities | 1,336 |  |
Real Estate |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gains on sales of real estate properties | 16,200 | 6,802 | 4,921
Subsidiaries |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Loss on Liquidating Subsidiary | ¥ 1,600 |  |

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