Stock-based compensation plans - Summary of the restricted stock unit plan during the fiscal years (Detail) - Restricted share units [member] - shares |
12 Months Ended | ||||
|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] | |||||
| Outstanding at beginning of the fiscal year | [1] | 15,089,851 | 8,255,925 | 2,443,150 | |
| Units granted | [1] | 8,885,104 | 10,215,944 | 6,913,640 | |
| Adjustment of the number of shares to be delivered | [1] | 493,816 | |||
| Vesting | [1] | (5,250,576) | (2,746,775) | (757,040) | |
| Forfeited | [1] | (1,370,809) | (635,243) | (343,825) | |
| Outstanding at end of the fiscal year | [1] | 17,847,386 | 15,089,851 | 8,255,925 | |
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