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Share-based payments (Details Textual)
 1 Months Ended 12 Months Ended
Jan. 20, 2015
Mar. 31, 2025
shares
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Jul. 31, 2014
shares
Statements [Line Items]                        
Number of share options granted in share-based payment arrangement   8,630,671 0 25,000                
Number of share options exercisable in share-based payment arrangement   1,043,802 5,183,587 5,584,478                
Associate Stock Option Plan 2014 [Member]                        
Statements [Line Items]                        
Number of shares reserved for issue under options and contracts for sale of shares                       25,000,000
Number of share options granted in share-based payment arrangement 5,870,800     25,000 195,000 465,000 7,220,000 335,000 150,000 525,000 184,300  
Options Plan One [Member]                        
Statements [Line Items]                        
Description of vesting requirements for share-based payment arrangement   4,304,600 Options (Option Plan I): 3/5th of the options vest at the end of one year from the date of grant. The remaining 2/5th vests at the end of every half year during second and third years from the date of grant in four equal instalments                    
Options Plan Two [Member]                        
Statements [Line Items]                        
Description of vesting requirements for share-based payment arrangement   6,612,700 Options (Option Plan II): 2/5th of the options vest at the end of one year from the date of grant. The remaining 3/5th vests at the end of every half year during second, third and fourth years in six equal instalments                    
Options Plan Three [Member]                        
Statements [Line Items]                        
Description of vesting requirements for share-based payment arrangement   4,052,800 Options (Option Plan III): 2/5th of the options vest at the end of two years from the date of grant. The remaining 3/5th vests at the end of every half year during third, fourth and fifth years in six equal instalments.                    
Optional Plan [Member]                        
Statements [Line Items]                        
Number of share options exercisable in share-based payment arrangement   173,967                    
Restated number of outstanding share option   223,606