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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, 2022
Mar. 31, 2021
Disclosure of Detailed Information Realting to Equity Instruments Measured to Fair Value Through Other Comphrehensive Income Derecognized Explanatory [Abstract]    
Fair value at derecognition ¥ 11,015 ¥ 2,644
Cumulative amount recognized in other comprehensive income, net of tax [1] 5,784 (6,085)
Dividend received ¥ 70 ¥ 5
[1] The cumulative amount recognized in other comprehensive income, net of tax was transferred to retained earnings upon derecognition of the equity instruments.