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Stock-based compensation plan - Restricted Share Units, Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 01, 2020
shares
Mar. 31, 2022
$ / shares
R / $
Mar. 31, 2022
shares
Mar. 31, 2022
USD ($)
Mar. 31, 2022
$ / R
Mar. 31, 2022
$ / £
Mar. 31, 2021
$ / R
Mar. 31, 2021
$ / £
Mar. 31, 2020
$ / R
Mar. 31, 2020
$ / £
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exchange rate   14.4916     14.49 0.76 14.92 0.73 17.92 0.81
RSUs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares granted (in shares) 2,000,000                  
Award vesting percentage   50.00%                
Estimated forfeiture rate   5.00%                
Weighted-average grant-date fair value (in dollars per share) | $ / shares   $ 0.34                
Unrecognized compensation cost | $       $ 0.2            
Expected period for recognition of unvested awards   1 year                
Weighted average remaining contractual term   1 year                
RSUs | LTIP | Maximum | Any Financial Year                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares to be granted (in shares)     2,000,000              
RSUs | LTIP | Maximum | Over the Life of the Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares to be granted (in shares)     12,000,000