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Financing receivables - Analysis of Each Class of Loans Not Carried at Fair Value Using Nomura's Internal Ratings or Equivalent Credit Quality Indicators (Detail) (JPY ¥)
In Millions, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Financing receivable, recorded investment [Line items]    
Loans receivable gross ¥ 1,077,661nmr_LoansReceivableGross ¥ 1,029,716nmr_LoansReceivableGross
Secured loans at banks [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 173,146nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredLoansAtBanksMember		 166,765nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredLoansAtBanksMember
Unsecured loans at banks [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 114,290nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredLoansAtBanksMember		 108,201nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredLoansAtBanksMember
Short-term secured margin loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 371,654nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_ShortTermSecuredMarginLoansMember		 421,809nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_ShortTermSecuredMarginLoansMember
Secured inter-bank money market loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 10,877nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredInterBankMoneyMarketLoansMember		 12,885nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredInterBankMoneyMarketLoansMember
Unsecured inter-bank money market loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 20,064nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredInterBankMoneyMarketLoansMember		 30,000nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredInterBankMoneyMarketLoansMember
Secured corporate loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 378,480nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredCorporateLoansMember		 251,100nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredCorporateLoansMember
Unsecured corporate loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 6,013nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredCorporateLoansMember		 33,159nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredCorporateLoansMember
Advances to affiliated companies [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 3,137nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_AdvancesToAffiliatedCompaniesMember		 5,797nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_AdvancesToAffiliatedCompaniesMember
AAA-BBB [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 466,915nmr_LoansReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember		 394,052nmr_LoansReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember
AAA-BBB [Member] | Secured loans at banks [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 103,753nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredLoansAtBanksMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember		 98,356nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredLoansAtBanksMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember
AAA-BBB [Member] | Unsecured loans at banks [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 110,414nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredLoansAtBanksMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember		 108,199nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredLoansAtBanksMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember
AAA-BBB [Member] | Short-term secured margin loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
AAA-BBB [Member] | Secured inter-bank money market loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 10,877nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredInterBankMoneyMarketLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember		 12,885nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredInterBankMoneyMarketLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember
AAA-BBB [Member] | Unsecured inter-bank money market loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 20,064nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredInterBankMoneyMarketLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember		 30,000nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredInterBankMoneyMarketLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember
AAA-BBB [Member] | Secured corporate loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 215,648nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember		 136,302nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember
AAA-BBB [Member] | Unsecured corporate loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 3,181nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember		 3,395nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember
AAA-BBB [Member] | Advances to affiliated companies [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 2,978nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_AdvancesToAffiliatedCompaniesMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember		 4,915nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_AdvancesToAffiliatedCompaniesMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_AAABBBMember
BB-CCC [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 193,903nmr_LoansReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= nmr_BBCCCMember		 168,306nmr_LoansReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= nmr_BBCCCMember
BB-CCC [Member] | Secured loans at banks [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 34,023nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredLoansAtBanksMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_BBCCCMember		 33,669nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredLoansAtBanksMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_BBCCCMember
BB-CCC [Member] | Unsecured loans at banks [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 3,874nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredLoansAtBanksMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_BBCCCMember		   
BB-CCC [Member] | Short-term secured margin loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
BB-CCC [Member] | Secured inter-bank money market loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
BB-CCC [Member] | Unsecured inter-bank money market loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
BB-CCC [Member] | Secured corporate loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 155,847nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_BBCCCMember		 107,141nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_BBCCCMember
BB-CCC [Member] | Unsecured corporate loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross    26,902nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_BBCCCMember
BB-CCC [Member] | Advances to affiliated companies [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 159nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_AdvancesToAffiliatedCompaniesMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_BBCCCMember		 594nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_AdvancesToAffiliatedCompaniesMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_BBCCCMember
CC-D [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 4,851nmr_LoansReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= nmr_CCDMember		 5,721nmr_LoansReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= nmr_CCDMember
CC-D [Member] | Secured loans at banks [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
CC-D [Member] | Unsecured loans at banks [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 2nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredLoansAtBanksMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_CCDMember		 2nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredLoansAtBanksMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_CCDMember
CC-D [Member] | Short-term secured margin loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
CC-D [Member] | Secured inter-bank money market loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
CC-D [Member] | Unsecured inter-bank money market loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
CC-D [Member] | Secured corporate loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 4,849nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_CCDMember		 5,719nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_CCDMember
CC-D [Member] | Unsecured corporate loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
CC-D [Member] | Advances to affiliated companies [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
Others [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 411,992nmr_LoansReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= nmr_OthersMember		 [1] 461,637nmr_LoansReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= nmr_OthersMember		 [1]
Others [Member] | Secured loans at banks [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 35,370nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredLoansAtBanksMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_OthersMember		 [1] 34,740nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredLoansAtBanksMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_OthersMember		 [1]
Others [Member] | Unsecured loans at banks [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
Others [Member] | Short-term secured margin loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 371,654nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_ShortTermSecuredMarginLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_OthersMember		 [1] 421,809nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_ShortTermSecuredMarginLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_OthersMember		 [1]
Others [Member] | Secured inter-bank money market loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
Others [Member] | Unsecured inter-bank money market loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross      
Others [Member] | Secured corporate loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 2,136nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_OthersMember		 [1] 1,938nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_SecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_OthersMember		 [1]
Others [Member] | Unsecured corporate loans [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross 2,832nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_OthersMember		 [1] 2,862nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_UnsecuredCorporateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_OthersMember		 [1]
Others [Member] | Advances to affiliated companies [Member]    
Financing receivable, recorded investment [Line items]    
Loans receivable gross    ¥ 288nmr_LoansReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nmr_AdvancesToAffiliatedCompaniesMember
/ us-gaap_InternalCreditAssessmentAxis
= nmr_OthersMember		 [1]
[1] Relate to collateralized exposures where a specified ratio of LTV is maintained.