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Operating Segments - External Revenue and Non-current Assets (Excluding Goodwill and Intangible Assets) by Geographic Area (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disclosure of geographical areas [Line Items]
Revenue	$ 809,120	$ 757,956	$ 602,546
Non-current assets (excluding goodwill and intangible assets)	60,998	60,606
UK [member]
Disclosure of geographical areas [Line Items]
Revenue	253,962	258,863	248,588
Non-current assets (excluding goodwill and intangible assets)	2,144	756
USA [Member
Disclosure of geographical areas [Line Items]
Revenue	335,880	308,436	196,193
Non-current assets (excluding goodwill and intangible assets)	3,777	5,112
India [member]
Disclosure of geographical areas [Line Items]
Non-current assets (excluding goodwill and intangible assets)	26,708	26,167
South Africa [member]
Disclosure of geographical areas [Line Items]
Revenue	38,866	42,841	42,717
Non-current assets (excluding goodwill and intangible assets)	6,374	10,529
Philippines [member]
Disclosure of geographical areas [Line Items]
Non-current assets (excluding goodwill and intangible assets)	18,797	14,050
Rest of the world [member]
Disclosure of geographical areas [Line Items]
Revenue	46,842	34,021	28,501
Non-current assets (excluding goodwill and intangible assets)	3,198	3,992
Europe (excluding UK) [member]
Disclosure of geographical areas [Line Items]
Revenue	56,383	47,169	37,494
Australia [member]
Disclosure of geographical areas [Line Items]
Revenue	$ 77,187	$ 66,626	$ 49,053

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- Definition

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- Definition

The amount of revenue arising from the rendering of services. [Refer: Revenue]

+ 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

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The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets, goodwill and intangibles.

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