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Variable Interest Entities - Additional Information (Detail) (Variable Interest Entity, Not Primary Beneficiary, JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
VIEs for acquisition of real estate and real estate development projects for customers
Variable Interest Entity [Line Items]
Additional fund contributed to certain non-consolidated VIEs to support their repayment		¥ 2,000
VIEs for acquisition of real estate for the Company and its subsidiaries' real estate-related business
Variable Interest Entity [Line Items]
Additional fund contributed to certain non-consolidated VIEs to support their repayment	¥ 0	¥ 646

X

- Definition

The amount of financial or other support the reporting entity has provided (explicitly or implicitly) to the Variable Interest Entity (VIE) that it was not previously contractually required to provide or that the reporting entity intends to provide, including, for example, situations in which the reporting entity assisted the VIE in obtaining another type of support.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 5A

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685

+ Details

Name:	us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration