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Revenue - Summary of Revenue by Service Type (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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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