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Acquisitions - Additional Information (Detail)
In Millions
12 Months Ended
Mar. 31, 2011
USD ($)
Mar. 31, 2011
JPY (¥)
Mar. 31, 2010
JPY (¥)
Mar. 31, 2009
JPY (¥)
Business Acquisition [Line Items]        
Acquisition, total cost of acquired entity       ¥ 11,207
Acquisition, cost of acquired entity paid in cash 780 64,875 12,142  
Goodwill acquired 352 29,247 1,786 5,357
Acquisition, amount of goodwill adjustment   1,740 3,466  
Intangible assets acquired     0 0
Acquisition, adjustment of acquired intangible assets other than goodwill   ¥ 140 ¥ 201