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Income Taxes - Reconciliation of Estimated Income Tax to Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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