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Income Taxes - Reconciliation of Estimated Income Tax to Income Tax Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Major components of tax expense (income) [abstract] |  |  |
Profit before income taxes | $ 131,152 | $ 101,867 | $ 55,293
Income tax expense at tax rates applicable to individual entities | 41,264 | 32,702 | 21,765
Effect of: |  |  |
Items not deductible for tax | 544 | 221 | 455
Exempt income | (16,024) | (11,250) | (7,706)
Non tax deductible goodwill impairment |  |  | 4,335
(Gain)/loss in respect of which deferred tax (liability)/asset not recognized due to uncertainty and ineligibility to carry forward | 138 | 324 | (105)
Recognition of unutilized tax benefits / Unrecognized losses utilized | (841) |  | (1,220)
Temporary difference that will reverse during tax holiday period | 614 | 22 | 1,580
Change in tax rate and law | (401) | (5,685) | 78
Provision for uncertain tax position |  |  | (1,499)
State taxes | 620 | 317 | 14
Due to acquisitions and merger |  | (1,686) |
One time tax on undistributed earnings |  | 266 |
Others, net | (195) | 200 | (167)
Income tax expense | $ 25,719 | $ 15,431 | $ 17,530

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