Stock-based compensation plans - Summary of the Stock Option Plan (Detail)	12 Months Ended
Mar. 31, 2022 shares ¥ / shares	Mar. 31, 2021 shares ¥ / shares
Disclosure of number and weighted average exercise prices of share options [Abstract]
Beginning \| shares	14,022,400	12,876,700
Number of shares, Granted \| shares	4,876,400	4,534,600
Number of shares, Exercised \| shares	1,944,900	3,178,300
Number of shares, Forfited or expired \| shares	409,600	210,600
Ending \| shares	16,544,300	14,022,400
Number of shares, Exercisable \| shares	7,044,700	5,800,700
Beginning \| ¥ / shares	¥ 6,653	¥ 4,982
Weighted average exercise price, Granted \| ¥ / shares	14,188	9,221
Weighted average exercise price, Exercised \| ¥ / shares	5,313	3,911
Weighted average exercise price, Forfieted or expired \| ¥ / shares	9,484	6,280
Ending \| ¥ / shares	9,397	6,653
Weighted average exercise price, Exercisable \| ¥ / shares	¥ 5,883	¥ 4,535

The number of share options outstanding in a share-based payment arrangement.

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