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Goodwill and Intangible Assets - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Intangible assets acquired	¥ 66,483
Acquired finite lived intangible assets amount	65,710
Aggregate amortization expense for intangible assets	¥ 75,890	¥ 57,023	¥ 52,763

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 or used in operations using the indirect method.

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