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Commitments Guarantees and Contingent Liabilities - Additional Information (Detail) In Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥) | Mar. 31, 2011 Corporate loans USD ($) | Mar. 31, 2011 Corporate loans JPY (¥) | Mar. 31, 2010 Corporate loans JPY (¥) | Mar. 31, 2011 Corporate loans Performance Guarantee USD ($) | Mar. 31, 2011 Corporate loans Performance Guarantee JPY (¥)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Commitments for purchase of equipment to be leased at cost | $ 137 | ¥ 11,423 |  |  |  |  |  |  |
Total rental payments under operating lease agreements | 98 | 8,131 | 9,571 | 10,422 |  |  |  |  |
Payments for computer systems under non-cancelable contracts | 9 | 759 | 1,029 | 985 |  |  |  |  |
Longest non-cancelable contracts matured period | Mature in fiscal 2013 | Mature in fiscal 2013 |  |  |  |  |  |  |
Estimated construction costs | 1,630 | 135,567 |  |  |  |  |  |  |
Total unused credit and capital amount available | 934 | 77,694 |  |  |  |  |  |  |
Guarantee Obligations Maximum Exposure | 5,971 | 496,452 | 340,249 |  | 3,756 | 312,273 | 321,448 | 14,877 | 1,237,000
Guarantee Obligations Current Carrying Value | $ 79 | ¥ 6,533 | ¥ 5,631 |  | $ 24 | ¥ 1,958 | ¥ 2,986 | $ 8 | ¥ 702

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph c + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph b + Details
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- Definition The payments made in the period which reduced loss contingency reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 + Details
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- Definition The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of the disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from a supplier, or to commit resources to supply goods or services to a customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 25 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 + Details
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