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Pension and Other Employee Obligations - Contributions to Defined Contribution Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Disclosure of geographical areas [Line Items]
Contributions to defined contribution plans	$ 11,684	$ 10,265	$ 7,458
India [member]
Disclosure of geographical areas [Line Items]
Contributions to defined contribution plans	8,123	7,587	5,173
Philippines [member]
Disclosure of geographical areas [Line Items]
Contributions to defined contribution plans	127	106	83
South Africa [member]
Disclosure of geographical areas [Line Items]
Contributions to defined contribution plans	860	715	617
Sri Lanka [member]
Disclosure of geographical areas [Line Items]
Contributions to defined contribution plans	625	661	612
UK [member]
Disclosure of geographical areas [Line Items]
Contributions to defined contribution plans	670	780	681
USA [Member
Disclosure of geographical areas [Line Items]
Contributions to defined contribution plans	$ 1,279	$ 416	$ 292

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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.

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No definition available.

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- Definition

The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 53
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_53&doctype=Standard
-URIDate 2017-03-09

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