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Goodwill and Other Intangible Assets - Additional Information (Detail) In Millions | 12 Months Ended
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Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥)
Intangible Assets by Major Class [Line Items] |  |  |  |
Aggregate amortization expenses for intangible assets | $ 87 | ¥ 7,244 | ¥ 8,203 | ¥ 9,021
Estimated amortization expenses in fiscal 2012 | 83 | 6,876 |  |
Estimated amortization expenses in fiscal 2013 | 76 | 6,329 |  |
Estimated amortization expenses in fiscal 2014 | 63 | 5,213 |  |
Estimated amortization expenses in fiscal 2015 | 45 | 3,761 |  |
Estimated amortization expenses in fiscal 2016 | $ 34 | ¥ 2,835 |  |

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- Definition Intangible Assets by Major Class [Line Items] + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) + Details
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- Definition The amount of amortization expense expected to be recognized during the fifth twelve-month period following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) + Details
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- Definition The amount of amortization expense expected to be recognized during the fourth twelve-month period following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) + Details
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- Definition The amount of amortization expense expected to be recognized during the twelve-month period following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) + Details
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- Definition The amount of amortization expense expected to be recognized during the third twelve-month period following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) + Details
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- Definition The amount of amortization expense expected to be recognized during the second twelve-month period following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) + Details
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