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Fair value measurements - Information on investments where net asset value per share is calculated or disclosed (Detail) - JPY (¥)
¥ in Billions
6 Months Ended 12 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value ¥ 49 ¥ 48
Unfunded commitments [1] 24 31
Hedge funds [Member]    
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value 15 12
Unfunded commitments [1] ¥ 1 ¥ 1
Redemption frequency (if currently eligible) [2] Monthly Monthly
Hedge funds [Member] | Minimum [Member]    
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Redemption notice [3] 1 day 1 day
Hedge funds [Member] | Maximum [Member]    
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Redemption notice [3] 30 days 30 days
Venture capital funds [Member]    
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value ¥ 10 ¥ 10
Unfunded commitments [1] ¥ 9 ¥ 10
Redemption frequency (if currently eligible) [2]
Redemption notice [3]
Private equity funds [Member]    
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value ¥ 21 ¥ 22
Unfunded commitments [1] ¥ 13 ¥ 19
Redemption frequency (if currently eligible) [2]
Redemption notice [3]
Real estate funds [Member]    
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value ¥ 3 ¥ 4
Unfunded commitments [1] ¥ 1 ¥ 1
Redemption frequency (if currently eligible) [2]
Redemption notice [3]
[1] The contractual amount of any unfunded commitments Nomura is required to make to the entities in which the investment is held.
[2] The range in frequency with which Nomura is permitted to redeem investments.
[3] The range in notice period required to be provided before redemption is possible.