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Stock-Based Compensation - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash received from the exercise of stock options ¥ 863 ¥ 345 ¥ 55
Unrecognized compensation costs 0    
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of options exercised 403 136 5
Incremental stock-based compensation costs recognized 0 0 0
Stock Options | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average vesting period 1 year 9 months    
Weighted average exercise period 9 years 9 months 29 days    
Stock Options | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average vesting period 1 year 11 months 1 day    
Weighted average exercise period 9 years 11 months 1 day    
Stock Compensation Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Points granted 399,000    
Points settled for individuals retired 93,250    
Points outstanding 2,043,542    
Incremental stock-based compensation costs recognized ¥ 609 ¥ 410 ¥ 288