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Stock-based compensation plan - SARs, Narrative (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
$ / R
Mar. 31, 2020
USD ($)
$ / shares
$ / R
Mar. 31, 2022
R / $
Mar. 31, 2022
$ / R
Mar. 31, 2022
$ / £
Mar. 31, 2021
$ / £
Mar. 31, 2020
$ / £
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exchange rate   14.92 17.92 14.4916 14.49 0.76 0.73 0.81
SARs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percentage 25.00%              
Award expiration period 6 years              
Annual total shareholder return percentage (in excess of) 10.00%              
Estimated forfeiture rate 5.00%              
Weighted-average grant-date fair value (in dollars per share) | $ / shares $ 0.22 $ 0.16 $ 0.22          
Total intrinsic value of awards exercised $ 3,010 $ 570 $ 1,250          
Unrecognized compensation cost $ 2,810              
Expected period for recognition of unvested awards 4 years 25 days