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Revenue - Summary of Revenue by Service Type (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disclosure of products and services [line items]
Revenue	$ 809,120	$ 757,956	$ 602,546
Industry-specific [member]
Disclosure of products and services [line items]
Revenue	307,214	258,155	170,212
Customer interaction services [member]
Disclosure of products and services [line items]
Revenue	183,199	193,427	168,096
Finance and accounting [member]
Disclosure of products and services [line items]
Revenue	175,194	162,432	124,089
Research and analytics [member]
Disclosure of products and services [line items]
Revenue	91,716	89,402	79,948
Auto claims [member]
Disclosure of products and services [line items]
Revenue	34,885	35,414	44,642
Others [member]
Disclosure of products and services [line items]
Revenue	$ 16,912	$ 19,127	$ 15,559

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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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The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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