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Regulatory requirements - Additional Information (Detail)
Mar. 31, 2013
USD ($)
Mar. 31, 2013
JPY (¥)
Mar. 31, 2013
SGD
Mar. 31, 2012
JPY (¥)
Mar. 31, 2013
Nomura Securities [Member]
Mar. 31, 2012
Nomura Securities [Member]
Mar. 31, 2013
Nomura Financial Products & Services, Inc. [Member]
Common equity Tier 1 capital ratio 3.50% 3.50% 3.50%        
Tier 1 capital ratio 4.50% 4.50% 4.50%        
Capital adequacy ratio 8.00% 8.00% 8.00%   120.00% 120.00% 120.00%
Quantified total of business risk 120.00% 120.00% 120.00%        
Segregated bonds with a market value   ¥ 459,037,000,000   ¥ 269,979,000,000      
Equities with a market value   7,861,000,000   6,353,000,000      
Net capital defined under the alternative method 1,000,000            
Ratio of net capital under the alternative method 2.00% 2.00% 2.00%        
Percentage of total risk margin requirement 8.00% 8.00% 8.00%        
Minimum capital required     15,000,000