Expected Future Benefit Payments (Detail) (JPY ¥) In Millions, unless otherwise specified	Mar. 31, 2012
Japanese plans
Defined Benefit Plan Disclosure [Line Items]
2013	¥ 26,197
2014	28,084
2015	30,972
2016	33,553
2017	34,518
2018 - 2022	209,895
Foreign plans
Defined Benefit Plan Disclosure [Line Items]
2013	9,418
2014	9,485
2015	10,461
2016	10,163
2017	10,827
2018 - 2022	¥ 58,880

The amount of the aggregate benefits expected to be paid in the five fiscal years thereafter (the aggregate amount of benefits expected to be paid in years 6 through 10 after the date of the latest statement of financial position).

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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