Goodwill and Other Intangible Assets (Schedule of Indefinite Lived Intangible Assets) (Details) (JPY ¥) In Millions	Mar. 31, 2011	Mar. 31, 2010
Goodwill and Other Intangible Assets
Indefinite-lived intangible assets	¥ 3,133	¥ 5,432

The aggregate cost of a major indefinite-lived intangible asset class acquired, during the period, either individually or as part of a group of assets (in either an asset acquisition or business combination).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 44
-Subparagraph b

Name:	us-gaap_AcquiredIndefiniteLivedIntangibleAssetAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant