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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Statement of comprehensive income [abstract]      
Profit after tax $ 105,433 $ 86,436 $ 37,763
Other comprehensive income/(loss), net of taxes - Items that will not be reclassified to profit or loss:      
Pension adjustment, net of tax (104) 2,486 (1,804)
Other comprehensive income/(loss), net of taxes - Items that will be reclassified subsequently to profit or loss:      
Current period gain/(loss) 13,582 (341) 43,118
Net change in time value of option contracts designated as cash flow hedges (2,484)    
Reclassification to profit or loss (486) (26,436) (24,777)
Foreign currency translation (loss)/gain (37,230) 14,202 (7,810)
Income tax (expense)/benefit relating to above (1,877) 9,409 (6,921)
Other comprehensive income/(loss), net of taxes - Items that will be reclassified subsequently to profit or loss (28,495) (3,166) 3,610
Total other comprehensive (loss)/income, net of taxes (28,599) (680) 1,806
Total comprehensive income $ 76,834 $ 85,756 $ 39,569