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Related Party - List of the Company's Subsidiaries (Detail) - Subsidiary |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 15, 2017 | Jun. 14, 2016 | Mar. 31, 2019 | Mar. 31, 2018
WNS Global Services (UK) Limited [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Proportion of ownership interest |  |  | 71.70% |
WNS Global Services SA (Pty) Limited [Member] | WNS B-BBEE Staff Share Trust [Member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Proportion of ownership interest |  |  | 10.00% |
WNS Global Services SA (Pty) Limited [Member] | WNS Global Services (UK) Limited [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Proportion of ownership interest |  |  | 90.00% |
WNS Global Services Private Limited [member] | WNS Customer Solutions (Singapore) Private Limited [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Proportion of ownership interest |  |  | 20.00% |
WNS Global Services Private Limited [member] | WNS Global Services (UK) Limited [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Proportion of ownership interest |  |  | 28.30% |
WNS Global Services Private Limited [member] | WNS (Mauritius) Limited [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Proportion of ownership interest |  |  | 80.00% |
MTS HealthHelp Inc. [member] | HealthHelp Holdings LLC [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Proportion of ownership interest | 63.70% |  |  |
WNS North America Inc. [member] | HealthHelp Holdings LLC [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Proportion of ownership interest | 36.30% |  |  |
Value Edge Research Services Private Limited [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Number of subsidiaries acquired |  | 3 |  |
WNS Assistance Limited [member] | WNS Legal Assistance LLP [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Proportion of ownership interest |  |  | 98.75% |
WNS Assistance (Legal) Limited [member] | WNS Legal Assistance LLP [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Proportion of ownership interest |  |  | 1.25% |
WNS Legal Assistance LLP [member] | Prettys Solicitors LLP [member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Proportion of ownership interest |  |  |  | 20.00%

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- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 19B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_19B_c&doctype=Standard -URIDate 2018-03-16 + Details
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