XML 58 R53.htm IDEA: XBRL DOCUMENT v3.25.3
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, 2025
Mar. 31, 2025
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value ¥ 91 ¥ 77
Unfunded commitments [1] 15 17
Hedge funds [Member]    
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value 14 11
Unfunded commitments [1] ¥ 3 ¥ 4
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 ¥ 20 ¥ 19
Unfunded commitments [1] ¥ 3 ¥ 3
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 ¥ 53 ¥ 43
Unfunded commitments [1] ¥ 9 ¥ 10
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 ¥ 4 ¥ 4
Unfunded commitments [1] ¥ 0 ¥ 0
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 frequency with which Nomura is permitted to redeem investments.
[3] The range in prior notice period for redemption.