v3.26.1
Goodwill and Intangible Assets (Gross Carrying Amount, Accumulated Amortization and Net Carrying Amount of Intangible Assets) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Intangible Assets by Major Class [Line Items]    
Gross carrying amount ¥ 157,640 ¥ 143,254
Gross carrying amount 6,831 6,920
Gross carrying amount 164,471 150,173
Accumulated amortization 122,251 114,702
Net carrying amount 35,389 28,552
Net carrying amount 6,831 6,920
Net carrying amount 42,220 35,472
Customer relationships    
Intangible Assets by Major Class [Line Items]    
Gross carrying amount [1] 150,652 135,756
Accumulated amortization [1] 117,197 109,570
Net carrying amount [1] 33,455 26,186
Other    
Intangible Assets by Major Class [Line Items]    
Gross carrying amount 6,988 7,498
Accumulated amortization 5,054 5,131
Net carrying amount ¥ 1,934 ¥ 2,366
[1] Customer relationships were mainly acquired in connection with the merger of MHSC and Shinko on May 7, 2009 and the integration among asset management companies on October 1, 2016. See Note 1 “Basis of presentation and summary of significant accounting policies” for further information.