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Fair value measurements - Fair value of financial instruments measured on recurring basis (Parenthetical) (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2022
Mar. 31, 2022
Fair value measurements    
Other assets ¥ 786,317 ¥ 773,586
Investments in equity securities 127,256 133,897
Listed Equity [Member]    
Fair value measurements    
Investments in equity securities 92,584 101,503
Unlisted Equity [Member]    
Fair value measurements    
Investments in equity securities 34,672 32,394
Recurring [Member]    
Fair value measurements    
Trading assets and private equity and debt investments [1] 15,970,000 13,697,000
Recurring [Member] | Other assets [Member]    
Fair value measurements    
Other assets [1],[2],[3] 431,000 479,000
Recurring [Member] | Net asset value per share [Member]    
Fair value measurements    
Trading assets and private equity and debt investments 47,000 45,000
Recurring [Member] | Net asset value per share [Member] | Other assets [Member]    
Fair value measurements    
Other assets ¥ 3,000 ¥ 3,000
[1] Certain investments that are measured at fair value using net asset value per share as a practical expedient have not been classified in the fair value hierarchy. As of March 31, 2022 and September 30, 2022, the fair values of these investments which are included in Trading assets and private equity and debt investments were ¥45 billion and ¥47 billion, respectively. As of March 31, 2022 and September 30, 2022, the fair values of these investments which are included in Other assets were ¥3 billion and ¥3 billion, respectively.
[2] Includes equity investments that would have been accounted for under the equity method had Nomura not chosen to elect the fair value option.
[3] Includes equity investments which comprise listed and unlisted equity securities held for operating purposes in the amounts of ¥101,503 million and ¥32,394 million, respectively, as of March 31, 2022 and ¥92,584 million and ¥34,672 million, respectively, as of September 30, 2022.