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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Share capital [member]
Share premium [member]
Retained earnings [member]
Other components of equity: Foreign currency translation reserve [member]
Other components of equity: Cash flow hedging reserve [member]
Other components of equity: Pension adjustments [member]
Treasury shares [member]
Beginning balance at Mar. 31, 2015 $ 389,106 $ 8,141 $ 286,805 $ 180,345 $ (103,529) $ 15,445 $ 1,899  
Beginning balance at Mar. 31, 2015   51,950,662            
Shares issued for exercised options and RSUs (Refer note 22) 1,303 $ 70 1,233          
Shares issued for exercised options and RSUs (Refer note 22), shares   455,642            
Purchase of treasury shares (Refer note 18) (30,461)             $ (30,461)
Purchase of treasury shares (Refer note 18), shares               1,100,000
Share-based compensation expense (Refer note 22) 17,919   17,919          
Excess tax benefits relating to share-based options and RSUs (Refer note 23) 917   917          
Transactions with owners (10,322) $ 70 20,069         $ (30,461)
Transactions with owners, shares   455,642           1,100,000
Profit 59,880     59,880        
Other comprehensive income/(loss), net of taxes (30,475)       (20,828) (9,517) (130)  
Total comprehensive income/(loss) for the year 29,405     59,880 (20,828) (9,517) (130)  
Ending balance at Mar. 31, 2016 408,189 $ 8,211 306,874 240,225 (124,357) 5,928 1,769 $ (30,461)
Ending balance at Mar. 31, 2016   52,406,304           1,100,000
Shares issued for exercised options and RSUs (Refer note 22) 8,941 $ 122 8,819          
Shares issued for exercised options and RSUs (Refer note 22), shares   906,255            
Purchase of treasury shares (Refer note 18) (64,224)             $ (64,224)
Purchase of treasury shares (Refer note 18), shares               2,200,000
Share-based compensation expense (Refer note 22) 23,036   23,036          
Excess tax benefits relating to share-based options and RSUs (Refer note 23) (445)   (445)          
Transactions with owners (32,692) $ 122 31,410         $ (64,224)
Transactions with owners, shares   906,255           2,200,000
Profit 37,763     37,763        
Other comprehensive income/(loss), net of taxes 1,806       (7,810) 11,420 (1,804)  
Total comprehensive income/(loss) for the year 39,569     37,763 (7,810) 11,420 (1,804)  
Ending balance at Mar. 31, 2017 415,066 $ 8,333 338,284 277,988 (132,167) 17,348 (35) $ (94,685)
Ending balance at Mar. 31, 2017   53,312,559           3,300,000
Shares issued for exercised options and RSUs (Refer note 22) 1,347 $ 200 1,147          
Shares issued for exercised options and RSUs (Refer note 22), shares   1,521,521            
Purchase of treasury shares (Refer note 18) (39,546)             $ (39,546)
Purchase of treasury shares (Refer note 18), shares               1,100,000
Share-based compensation expense (Refer note 22) 30,565   30,565          
Purchase of equity from non-controlling interest (52)   (52)          
Excess tax benefits relating to share-based options and RSUs (Refer note 23) 1,820   1,820          
Transactions with owners (5,866) $ 200 33,480         $ (39,546)
Transactions with owners, shares   1,521,521           1,100,000
Profit 86,436     86,436        
Other comprehensive income/(loss), net of taxes (680)       14,202 (17,368) 2,486  
Total comprehensive income/(loss) for the year 85,756     86,436 14,202 (17,368) 2,486  
Ending balance at Mar. 31, 2018 $ 494,956 $ 8,533 $ 371,764 $ 364,424 $ (117,965) $ (20) $ 2,451 $ (134,231)
Ending balance at Mar. 31, 2018   54,834,080           4,400,000