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Regulatory requirements - Additional Information (Detail)
¥ in Millions, SGD in Millions
Mar. 31, 2016
JPY (¥)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
SGD
Mar. 31, 2015
JPY (¥)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Common equity Tier 1 capital ratio 5.25% 5.25% 5.25%  
Tier 1 capital ratio 6.75% 6.75% 6.75%  
Capital adequacy ratio 8.75% 8.75% 8.75%  
Quantified total of business risk 120.00% 120.00% 120.00%  
NSC [Member]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Quantified total of business risk 120.00% 120.00% 120.00% 120.00%
Segregated bonds with a market value | ¥ ¥ 433,289     ¥ 433,011
Equities with a market value | ¥ ¥ 17,647    
NFPS [Member]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Quantified total of business risk 120.00% 120.00% 120.00% 120.00%
NSI [Member]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
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%  
Amount of maintenance of net capital as cash   $ 1,000,000    
NGFP [Membrer]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Net capital defined under the alternative method   20,000,000    
ILLC [Member]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Net capital defined under the alternative method   $ 1,000,000    
Ratio of net capital under the alternative method 2.00% 2.00% 2.00%  
Minimum capital required   $ 45,000    
NSL [Member]        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Minimum capital required | SGD     SGD 15