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Combined Results of Operations of Company and its Subsidiaries (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	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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- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

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