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Fair value measurements - Geographic Allocations of Nomura's Trading Assets Related to Government, State, Municipal, and Government Agency Securities (Parenthetical) (Detail) (JPY ¥) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Fair value, concentration of credit risk [Line items]
Non-trading debt securities	¥ 920,611	¥ 862,758
Government, agency and municipal securities [Member]
Fair value, concentration of credit risk [Line items]
Non-trading debt securities	¥ 715,000	¥ 640,000

Amount of debt securities categorized neither as held-to-maturity nor trading.

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