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Combined Results of Operations of Company and its Subsidiaries (Detail) (JPY ¥) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Robeco Groep N. V. |  |
Business Acquisition [Line Items] |  |
Total revenues | ¥ 1,371,773 | ¥ 1,162,081
Income from Continuing Operations | 187,765 | 130,050
DAIKYO |  |
Business Acquisition [Line Items] |  |
Total revenues | 1,617,195 | 1,336,271
Income from Continuing Operations | ¥ 203,243 | ¥ 133,572

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