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Income Taxes - Additional Information (Detail) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Mar. 31, 2009	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)	Mar. 31, 2009 JPY (¥)
Income Taxes [Line Items]
National Corporate tax		30.00%	30.00%	30.00%	30.00%
Inhabitant tax		6.00%	6.00%	6.00%	6.00%
Enterprise tax		8.00%	8.00%	8.00%	8.00%
Statutory income tax rate		40.90%	40.90%	40.90%	40.90%
Revised Japanese tax code to reduce taxes on dividends of foreign subsidiaries	95.00%
Net changes in total valuation allowance		$ (193)	¥ (16,052)	¥ (1,789)	¥ 3,070
Net operating loss carryforwards		$ 1,665	¥ 138,428

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Corporate Inhabitant Tax Rate

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- Definition

Enterprise Tax Rate

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- Definition

Income Taxes [Line Items]

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- Definition

National Corporate Tax Rate

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- Definition

Tax Rate On Dividends Reduction

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate shall be the regular tax rate if there are alternative tax systems.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 47

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- Definition

The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 48
-Subparagraph a

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Total increases (decreases) in allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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