Goodwill and Other Intangible Assets (Intangible Assets Not Subject to Amortization) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	¥ 7,046	¥ 7,156
Trademark
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	7,045	7,155
Other intangible assets
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	¥ 1	¥ 1

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

Name:	us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant