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Goodwill and Other Intangible Assets - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Intangible Assets by Major Class [Line Items]      
Aggregate amortization expenses for intangible assets ¥ 17,112 ¥ 9,680 ¥ 7,066
Estimated amortization expenses in fiscal 2015 14,417    
Estimated amortization expenses in fiscal 2016 13,641    
Estimated amortization expenses in fiscal 2017 12,706    
Estimated amortization expenses in fiscal 2018 10,243    
Estimated amortization expenses in fiscal 2019 8,787    
Intangible assets subject to amortization acquired 52,575    
Impairment losses on intangible assets 0 0 0
Software
      
Intangible Assets by Major Class [Line Items]      
Intangible assets subject to amortization acquired 13,051    
Weighted average amortization period 6 years    
Customer relationships
      
Intangible Assets by Major Class [Line Items]      
Intangible assets subject to amortization acquired ¥ 36,488    
Weighted average amortization period 8 years