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Short-Term and Long-Term Debt - Additional Information (Detail) In Millions, except Share data | 12 Months Ended |  |  | 12 Months Ended |  |  |
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Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥) | Mar. 31, 2011 Unsecured Convertible Bonds With Stock Acquisition Rights USD ($) | Mar. 31, 2011 Unsecured Convertible Bonds With Stock Acquisition Rights JPY (¥) | Dec. 31, 2008 Unsecured Convertible Bonds With Stock Acquisition Rights JPY (¥) | Mar. 31, 2011 Minimum Unsecured Bond With Stock Acquisition Rights USD ($) | Mar. 31, 2011 Maximum Unsecured Bond With Stock Acquisition Rights USD ($) | Mar. 31, 2011 Unsecured Bond With Stock Acquisition Rights USD ($) | Jun. 30, 2002 Unsecured Bond With Stock Acquisition Rights USD ($) | Mar. 31, 2011 Securities Pledged as Collateral USD ($) | Mar. 31, 2011 Securities Pledged as Collateral JPY (¥)
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured bond issued |  |  |  |  |  |  | ¥ 150,000 |  |  |  | $ 400 |  |
Unamortized Discount of debt |  |  |  |  |  |  |  |  |  |  | 622 |  |
Debt instrument convertible into shares of common stock, shares |  |  |  |  | 21,917,371 | 21,917,371 |  |  |  | 2,493,309 |  |  |
Debt instrument conversion Price |  |  |  |  | $ 82.29 | ¥ 6,842.70 |  |  |  | $ 115.12 |  |  |
Debt instrument conversion trigger stock price threshold accretion |  |  |  |  |  |  |  | $ 126.63 | $ 320.72 |  |  |  |
Net amortization expenses of bond premiums and discounts, deferred issuance costs of bonds and medium-term notes | 48 | 3,996 | 4,022 | 3,551 |  |  |  |  |  |  |  |  |
Total committed credit lines | 5,585 | 464,432 | 426,729 |  |  |  |  |  |  |  |  |  |
Available credit lines | 4,936 | 410,447 | 385,892 |  |  |  |  |  |  |  |  |  |
Long-term committed credit lines | 1,287 | 107,010 | 162,337 |  |  |  |  |  |  |  |  |  |
Investment in securities pledged for primarily collateral deposits | $ 14,136 | ¥ 1,175,381 | ¥ 1,104,158 |  |  |  |  |  |  |  |  | $ 705 | ¥ 58,607

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- Definition The component of interest expense representing the noncash expenses charged against earnings in the period to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 6 -Paragraph 9, 10, 11 + Details
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