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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Previously stated [member]
Adoption of IFRS 9 [member]
Adoption of IFRS 15 [member]
Restated Adjusted balance [member]
Share capital [member]
Share capital [member]
Previously stated [member]
Share capital [member]
Restated Adjusted balance [member]
Share premium [member]
Share premium [member]
Previously stated [member]
Share premium [member]
Restated Adjusted balance [member]
Retained earnings [member]
Retained earnings [member]
Previously stated [member]
Retained earnings [member]
Adoption of IFRS 9 [member]
Retained earnings [member]
Adoption of IFRS 15 [member]
Retained earnings [member]
Restated Adjusted balance [member]
Other components of equity: Foreign currency translation reserve [member]
Other components of equity: Foreign currency translation reserve [member]
Previously stated [member]
Other components of equity: Foreign currency translation reserve [member]
Restated Adjusted balance [member]
Other components of equity: Cash flow hedging reserve [member]
Other components of equity: Cash flow hedging reserve [member]
Previously stated [member]
Other components of equity: Cash flow hedging reserve [member]
Adoption of IFRS 9 [member]
Other components of equity: Cash flow hedging reserve [member]
Restated Adjusted balance [member]
Other components of equity: Pension adjustments [member]
Other components of equity: Pension adjustments [member]
Previously stated [member]
Other components of equity: Pension adjustments [member]
Restated Adjusted balance [member]
Treasury shares [member]
Treasury shares [member]
Previously stated [member]
Treasury shares [member]
Restated Adjusted balance [member]
Beginning balance at Mar. 31, 2016 $ 408,189         $ 8,211     $ 306,874     $ 240,225         $ (124,357)     $ 5,928       $ 1,769     $ (30,461)    
Beginning balance at Mar. 31, 2016           52,406,304                                         1,100,000    
Shares issued for exercised options and restricted share units ("RSUs") (Refer note 24) 8,941         $ 122     8,819                                        
Shares issued for exercised options and restricted share units ("RSUs") (Refer Note 24), shares           906,255                                              
Purchase of treasury shares (Refer note 19) (64,224)                                                   $ (64,224)    
Purchase of treasury shares (Refer note 19), shares                                                     2,200,000    
Share-based compensation (Refer Note 24) 23,036               23,036                                        
Excess tax benefits relating to share-based options and RSUs (445)               (445)                                        
Transactions with owners (32,692)         $ 122     31,410                                   $ (64,224)    
Transactions with owners, shares           906,255                                         2,200,000    
Profit after tax 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 period 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 restricted share units ("RSUs") (Refer note 24) 1,347         $ 200     1,147                                        
Shares issued for exercised options and restricted share units ("RSUs") (Refer Note 24), shares           1,521,521                                              
Purchase of treasury shares (Refer note 19) (39,546)                                                   $ (39,546)    
Purchase of treasury shares (Refer note 19), shares                                                     1,100,000    
Share-based compensation (Refer Note 24) 30,565               30,565                                        
Purchase of equity from non-controlling interest (52)               (52)                                        
Excess tax benefits relating to share-based options and RSUs 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 after tax 86,436                     86,436                                  
Other comprehensive income/(loss), net of taxes (680)                               14,202     (17,368)       2,486          
Total comprehensive income/(loss) for the period 85,756                     86,436         14,202     (17,368)       2,486          
Ending balance at Mar. 31, 2018 494,956 $ 494,956 $ 16 $ 5,511 $ 500,483 $ 8,533 $ 8,533 $ 8,533 371,764 $ 371,764 $ 371,764 364,424 $ 364,424 $ 2,777 $ 5,511 $ 372,712 (117,965) $ (117,965) $ (117,965) (20) $ (20) $ (2,761) $ (2,781) 2,451 $ 2,451 $ 2,451 $ (134,231) $ (134,231) $ (134,231)
Ending balance at Mar. 31, 2018           54,834,080 54,834,080 54,834,080                                     4,400,000 4,400,000 4,400,000
Shares issued for exercised options and restricted share units ("RSUs") (Refer note 24)           $ 96     (96)                                        
Shares issued for exercised options and restricted share units ("RSUs") (Refer Note 24), shares           719,140                                              
Cancellation of treasury shares (Refer Note 19)           $ (573)     (133,658)                                   $ 134,231    
Cancellation of treasury shares (Refer Note 19), shares           (4,400,000)                                         (4,400,000)    
Purchase of treasury shares (Refer note 19) (56,417)                                                   $ (56,417)    
Purchase of treasury shares (Refer note 19), shares                                                     1,101,300    
Share-based compensation (Refer Note 24) 30,305               30,305                                        
Excess tax benefits relating to share-based options and RSUs 1,214               1,214                                        
Transactions with owners (24,898)         $ (477)     (102,235)                                   $ 77,814    
Transactions with owners, shares           (3,680,860)                                         (3,298,700)    
Profit after tax 105,433                     105,433                                  
Other comprehensive income/(loss), net of taxes (28,599)                               (37,230)     8,735       (104)          
Total comprehensive income/(loss) for the period 76,834                     105,433         (37,230)     8,735       (104)          
Ending balance at Mar. 31, 2019 $ 552,419         $ 8,056     $ 269,529     $ 478,145         $ (155,195)     $ 5,954       $ 2,347     $ (56,417)    
Ending balance at Mar. 31, 2019           511,532,220                                         1,101,300