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Fair value measurements - Information on investments where net asset value per share is calculated or disclosed (Detail) - JPY (¥)
¥ in Billions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value ¥ 32 ¥ 38
Unfunded commitments [1] 13 13
Hedge funds [Member]    
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value 2 16
Unfunded commitments
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] 90 days 90 days
Venture capital funds [Member]    
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value ¥ 3 ¥ 2
Unfunded commitments [1] ¥ 3 ¥ 2
Redemption frequency (if currently eligible) [2] 0 0
Redemption notice [3]
Private equity funds [Member]    
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value ¥ 21 ¥ 17
Unfunded commitments [1] ¥ 9 ¥ 10
Redemption frequency (if currently eligible) [2] 0 0
Redemption notice [3]
Real estate funds [Member]    
Fair value, balance sheet grouping, financial statement captions [Line Items]    
Fair value ¥ 6 ¥ 3
Unfunded commitments [1] ¥ 1 ¥ 1
Redemption frequency (if currently eligible) [2] 0 0
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 can redeem investments.
[3] The range in notice period required to be provided before redemption is possible.