v3.26.1
Business combinations - Business Combination, Pro Forma Information (Detail) - Macquarie Management Holdings Inc [Member] - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Business Combination [Line Items]    
Total revenue ¥ 121,359 ¥ 136,649
Net income attributable to Nomura ¥ 21,327 ¥ 16,317