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Income before Income Taxes and Discontinued Operations, and Provision for Income Taxes (Detail) In Millions	12 Months Ended
	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)	Mar. 31, 2009 JPY (¥)	Mar. 31, 2011 Domestic Country USD ($)	Mar. 31, 2011 Domestic Country JPY (¥)	Mar. 31, 2010 Domestic Country JPY (¥)	Mar. 31, 2009 Domestic Country JPY (¥)	Mar. 31, 2011 Foreign Country USD ($)	Mar. 31, 2011 Foreign Country JPY (¥)	Mar. 31, 2010 Foreign Country JPY (¥)	Mar. 31, 2009 Foreign Country JPY (¥)
Income Taxes [Line Items]
Income before income taxes and discontinued operations	$ 1,106	¥ 91,965	¥ 54,593	¥ 12,035	$ 467	¥ 38,810	¥ 13,321	¥ (12,679)	$ 639	¥ 53,155	¥ 41,272	¥ 24,714
Current provision for income taxes	539	44,804	50,106	40,189	326	27,068	32,553	40,158	213	17,736	17,553	31
Deferred provision for income taxes	(207)	(17,187)	(27,712)	(42,787)	(163)	(13,534)	(22,285)	(51,155)	(44)	(3,653)	(5,427)	8,368
Provision for income taxes	$ 332	¥ 27,617	¥ 22,394	¥ (2,598)

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Income from continuing operations before income taxes and noncontrolling interest

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Income Taxes [Line Items]

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The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable income (loss) from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph a

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The component of income tax expense for the period representing the net change in the entity's deferred tax assets and liabilities pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph b

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

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The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph a, b

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