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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]
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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 |  |

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- Definition The amount of change in equity resulting from transactions and other events, other than those changes resulting from transactions with owners in their capacity as owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2018-01-01 -Paragraph 32 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=1&date=2018-03-01&anchor=para_32_a_ii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2018-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=1&date=2018-03-01&anchor=para_24_b&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B12 -Subparagraph b -Clause ix -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B12_b_ix&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_a&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B10_b&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 81A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_81A_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of equity attributable to the owners of the parent. This specifically excludes non-controlling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph r -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_r&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in the number of ordinary shares issued. [Refer: Ordinary shares [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in the number of shares outstanding. [Refer: Number of shares outstanding] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in equity through changes in ownership interests in subsidiaries that do not result in loss of control. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in equity resulting from share-based payment transactions. [Refer: Equity] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of income and expense (including reclassification adjustments) that is not recognised in profit or loss as required or permitted by IFRSs. [Refer: IFRSs [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d_ii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B12 -Subparagraph b -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B12_b_viii&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 81A -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_81A_b&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_a&doctype=Standard -URIDate 2018-03-16 + Details
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