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Business Combinations - Purchase Price Allocation to Assets Acquired and Liabilities Assumed of Value Edge Research Services Private Limited (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Apr. 01, 2018 | Mar. 31, 2018 | Jun. 14, 2016
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Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill on acquisition | $ 130,811 | $ 135,186 | $ 135,186 |
Value Edge Research Services Private Limited [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Cash |  |  |  | $ 432
Trade receivables |  |  |  | 370
Unbilled revenue |  |  |  | 706
Investments |  |  |  | 87
Prepayments and other current assets |  |  |  | 99
Property and equipment |  |  |  | 78
Deferred tax asset |  |  |  | 49
Non-current assets |  |  |  | 74
Current liabilities |  |  |  | (1,236)
Non-current liabilities |  |  |  | (126)
Deferred tax liability |  |  |  | (2,281)
Net assets acquired |  |  |  | 4,854
Less: Purchase consideration |  |  |  | 18,265
Goodwill on acquisition |  |  |  | 13,411
Value Edge Research Services Private Limited [member] | Software [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Intangible assets |  |  |  | 10
Value Edge Research Services Private Limited [member] | Customer contracts [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Intangible assets |  |  |  | 701
Value Edge Research Services Private Limited [member] | Customer relationships [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Intangible assets |  |  |  | 1,894
Value Edge Research Services Private Limited [member] | Trade names [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Intangible assets |  |  |  | 104
Value Edge Research Services Private Limited [member] | Covenant not-to-compete [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Intangible assets |  |  |  | 2,655
Value Edge Research Services Private Limited [member] | Technology [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Intangible assets |  |  |  | $ 1,238

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