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Goodwill and Other Intangible Assets - Additional Information (Detail) In Millions	12 Months Ended
	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]

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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)

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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
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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
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-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
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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
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-Name Statement of Financial Accounting Standard (FAS)
-Number 142
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The amount of amortization expense expected to be recognized during the third twelve-month period following the balance sheet date.

+ References

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-Name Statement of Financial Accounting Standard (FAS)
-Number 142
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The amount of amortization expense expected to be recognized during the second twelve-month period following the balance sheet date.

+ References

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-Name Statement of Financial Accounting Standard (FAS)
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