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Securitizations and Variable Interest Entities - Classification of Consolidated VIEs' Assets and Liabilities (Parenthetical) (Detail) (Variable Interest Entity, primary beneficiary [Member], JPY ¥)
In Billions, unless otherwise specified
Mar. 31, 2014
Variable Interest Entity, primary beneficiary [Member]
  
Variable Interest Entity [Line Items]  
Aircraft purchase deposits ¥ 5nmr_AircraftPurchaseDeposits
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember