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Goodwill - Summary of Movement in Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Beginning balance | $ 135,186 |  |
Impairment of goodwill recognized during the year | 0 | $ 0 | $ 21,673
Ending balance | 130,811 | 135,186 |
Accumulated impairment [member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Beginning balance | (24,314) | (21,673) |
Impairment of goodwill recognized during the year | 0 | 0 |
Foreign currency translation | 1,672 | (2,641) |
Ending balance | (22,642) | (24,314) | (21,673)
Accumulated impairment [member] | WNS global BPM [member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment of goodwill recognized during the year | 0 | 0 |
Accumulated impairment [member] | WNS Auto Claims BPM [member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Beginning balance | (24,314) | (21,673) |
Impairment of goodwill recognized during the year | 0 | 0 |
Foreign currency translation | 1,672 | (2,641) |
Ending balance | (22,642) | (24,314) | (21,673)
Gross carrying value [member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Beginning balance | 159,500 | 155,681 |
Goodwill arising on acquisitions | 203 | (92) |
Foreign currency translation | (6,250) | 3,911 |
Ending balance | 153,453 | 159,500 | 155,681
Gross carrying value [member] | WNS global BPM [member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Beginning balance | 130,553 | 129,878 |
Goodwill arising on acquisitions | 203 | (92) |
Foreign currency translation | (4,260) | 767 |
Ending balance | 126,496 | 130,553 | 129,878
Gross carrying value [member] | WNS Auto Claims BPM [member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Beginning balance | 28,947 | 25,803 |
Foreign currency translation | (1,990) | 3,144 |
Ending balance | $ 26,957 | $ 28,947 | $ 25,803

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- Definition The amount of additional goodwill recognised, except goodwill included in a disposal group that, on acquisition, meets the criteria to be classified as held for sale in accordance with IFRS 5. [Refer: Goodwill; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B67 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B67_d_ii&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B67_d&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 134 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_a&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 135 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_135_a&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B67_d_v&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B67 -Subparagraph d -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B67_d_vi&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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