v3.26.1
Financial instruments - Summary of Information Relating to Derecognized Equity Instruments Measured at Fair Value Through Other Comprehensive Income by Way of Sale (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of Detailed Information Realting to Equity Instruments Measured to Fair Value Through Other Comphrehensive Income Derecognized Explanatory [Abstract]    
Fair value at derecognition ¥ 10,073 ¥ 32,275
Cumulative amount recognized in other comprehensive income, net of tax [1] (3,892) (29,508)
Dividend received ¥ 0 ¥ 0
[1] The cumulative amount recognized in other comprehensive income, net of tax, was transferred to retained earnings upon derecognition of the equity instruments.