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Revenue - Summary of Revenue by Industry (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Disclosure of revenue by industry [line items] |  |  |
Revenue | $ 809,120 | $ 757,956 | $ 602,546
Insurance [member] |  |  |
Disclosure of revenue by industry [line items] |  |  |
Revenue | 215,242 | 194,593 | 178,196
Diversified businesses including manufacturing, retail, CPG, media and entertainment, and telecom [member] |  |  |
Disclosure of revenue by industry [line items] |  |  |
Revenue | 142,091 | 137,049 | 105,325
Travel and leisure [member] |  |  |
Disclosure of revenue by industry [line items] |  |  |
Revenue | 140,996 | 142,091 | 128,051
Healthcare [member] |  |  |
Disclosure of revenue by industry [line items] |  |  |
Revenue | 124,109 | 111,593 | 40,814
Utilities [member] |  |  |
Disclosure of revenue by industry [line items] |  |  |
Revenue | 56,334 | 66,030 | 56,059
Shipping and logistics [member] |  |  |
Disclosure of revenue by industry [line items] |  |  |
Revenue | 49,858 | 33,922 | 25,638
Consulting and professional services [member] |  |  |
Disclosure of revenue by industry [line items] |  |  |
Revenue | 44,142 | 39,683 | 41,876
Banking and financial services [member] |  |  |
Disclosure of revenue by industry [line items] |  |  |
Revenue | $ 36,348 | $ 32,995 | $ 26,587

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