v3.25.2
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, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding at beginning of the fiscal year 8,255,925 2,443,150  
Granted 10,215,944 6,913,640 2,499,210
Vesting 2,746,775 757,040  
Forfeited 635,243 343,825 56,060
Outstanding at end of the fiscal year 15,089,851 8,255,925 2,443,150