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Non-trading securities - Fair Value of Residual contractual Maturity of Non-trading Securities (Detail) (Insurance subsidiary [Member], JPY ¥)
In Millions, unless otherwise specified
Sep. 30, 2014
Insurance subsidiary [Member]
  
Non-trading debt securities [Line Items]  
Total ¥ 281,387nmr_AvailableForSaleSecuritiesDebtMaturities
/ dei_LegalEntityAxis
= nmr_InsuranceSubsidiaryMember
Less than 1 year 36,950us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ dei_LegalEntityAxis
= nmr_InsuranceSubsidiaryMember
1 to 5 years 127,172us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ dei_LegalEntityAxis
= nmr_InsuranceSubsidiaryMember
5 to 10 years 83,325us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ dei_LegalEntityAxis
= nmr_InsuranceSubsidiaryMember
More than 10 years ¥ 33,940us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ dei_LegalEntityAxis
= nmr_InsuranceSubsidiaryMember