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Stock-based compensation - Weighted Average Assumptions of Stock Options Granted (Details) - year
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure Of Share Based Payment Arrangements [Abstract]    
Expected volatility 52.22% 47.25%
Risk-free interest rate 3.05% 1.04%
Expected option life 3.92 4.07
Expected dividend yield 0.00% 0.00%
Forfeiture rate 26.55% 27.07%