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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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- Definition Corporate Inhabitant Tax Rate + Details
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- Definition Enterprise Tax Rate + Details
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- Definition Income Taxes [Line Items] + Details
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- Definition National Corporate Tax Rate + Details
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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 + Details
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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 + Details
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- Definition 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. + Details
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