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Capital and Reserves - Schedule of Share Capital and Share Premium (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure of classes of share capital [Line Items]      
Beginning balance $ 862,292 $ 1,357,368 $ 1,558,932
Shares issued during the year on exercise of share based awards 38,399 41,648 40,033
Ending balance 891,187 862,292 1,357,368
Share Capital [Member]      
Disclosure of classes of share capital [Line Items]      
Beginning balance 52 52 52
Ending balance 53 52 52
Share Premium [Member]      
Disclosure of classes of share capital [Line Items]      
Beginning balance 1,985,555 1,977,318 1,960,691
Ending balance $ 2,021,197 $ 1,985,555 $ 1,977,318
Ordinary shares [member]      
Disclosure of classes of share capital [Line Items]      
Beginning balance [1] 63,586,903 60,303,844  
Shares issued during the year on exercise of share based awards [1] 1,478,172 312,764  
Conversion of class B shares to ordinary shares [1]   2,970,295  
Ending balance [1] 65,065,075 63,586,903 60,303,844
Ordinary shares [member] | Share Capital [Member]      
Disclosure of classes of share capital [Line Items]      
Beginning balance [1] $ 32 $ 31  
Shares issued during the year on exercise of share based awards [1] 1    
Conversion of class B shares to ordinary shares [1]   1  
Ending balance [1] 33 32 $ 31
Ordinary shares [member] | Share Premium [Member]      
Disclosure of classes of share capital [Line Items]      
Beginning balance [1] 767,635 668,203  
Shares issued during the year on exercise of share based awards [1] 35,642 8,237  
Conversion of class B shares to ordinary shares [1]   91,195  
Ending balance [1] $ 803,277 $ 767,635 $ 668,203
Class B Shares [Member]      
Disclosure of classes of share capital [Line Items]      
Beginning balance [1] 39,667,911 42,638,206  
Conversion of class B shares to ordinary shares [1]   (2,970,295)  
Ending balance [1] 39,667,911 39,667,911 42,638,206
Class B Shares [Member] | Share Capital [Member]      
Disclosure of classes of share capital [Line Items]      
Beginning balance [1] $ 20 $ 21  
Conversion of class B shares to ordinary shares [1]   (1)  
Ending balance [1] 20 20 $ 21
Class B Shares [Member] | Share Premium [Member]      
Disclosure of classes of share capital [Line Items]      
Beginning balance [1] 1,217,920 1,309,115  
Conversion of class B shares to ordinary shares [1]   (91,195)  
Ending balance [1] $ 1,217,920 $ 1,217,920 $ 1,309,115
[1] Par value of USD 0.0005 per share