v3.26.1
Other assets - Office buildings, land, equipment and facilities and Other / Other liabilities - Schedule of changes in goodwill within Other assets-Other (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Goodwill [Line Items]    
Gross carrying amount, Beginning of year ¥ 110,736 ¥ 112,797
Accumulated Impairment, Beginning of year (93,537) (93,537)
Net carrying amount, Beginning of year 17,199 19,260
Acquisition, Changes during year 151,011  
Impairment, Changes during year [1] (35)  
Other, Changes during year [2] 4,317 (2,061)
Gross carrying amount, End of year 266,064 110,736
Accumulated Impairment, End of year (93,572) (93,537)
Net carrying amount, End of year ¥ 172,492 17,199
Goodwill Impairment Loss Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag true  
Investment Management [Member]    
Goodwill [Line Items]    
Acquisition, Changes during year [3] ¥ 150,976  
Other, Changes during year [2],[3] 3,128  
Gross carrying amount, End of year [3] 154,104  
Net carrying amount, End of year [3] 154,104  
Wholesale [Member]    
Goodwill [Line Items]    
Gross carrying amount, Beginning of year 110,318 112,379
Accumulated Impairment, Beginning of year (93,537) (93,537)
Net carrying amount, Beginning of year 16,781 18,842
Other, Changes during year [2] 1,189 (2,061)
Gross carrying amount, End of year 111,507 110,318
Accumulated Impairment, End of year (93,537) (93,537)
Net carrying amount, End of year 17,970 16,781
Other [Member]    
Goodwill [Line Items]    
Gross carrying amount, Beginning of year 418 418
Net carrying amount, Beginning of year 418 418
Acquisition, Changes during year 35  
Impairment, Changes during year [1] (35)  
Gross carrying amount, End of year 453 418
Accumulated Impairment, End of year (35)  
Net carrying amount, End of year ¥ 418 ¥ 418
[1] The impairment recognized during the current period was not a significant amount.
[2] Includes currency translation adjustments.
[3] Nomura recognized goodwill in December 2025 as a result of the Macquarie Acquisition. See Note 10 “Business Combinations” for further information.