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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:      
Profit after tax $ 105,433 $ 86,436 $ 37,763
Adjustments to reconcile profit after tax to net cash generated from operating activities:      
Depreciation and amortization 36,117 35,459 37,442
Impairment of goodwill     21,673
Share-based compensation expense 30,305 30,565 23,036
Amortization of debt issue cost 360 488 52
Allowances for expected credit losses ("ECL") 659 (499) (1,040)
Unrealized exchange (gain)/loss, net (2,441) 2,663 (11,123)
Current tax expense 27,526 24,494 25,785
Interest expense 2,844 3,778 495
Interest income (2,556) (3,693) (2,083)
Income from marketable securities (7,979) (3,570) (4,131)
Unrealized gain on investments   (3) (6)
Income from funds held in escrow   (239) (280)
Loss/ (gain) on sale of property and equipment 25 (325) 143
Deferred income taxes (1,807) (9,063) (8,255)
Deferred rent 1,578 1,289 1,136
Excess tax benefit from share-based compensation expense (1,260) (685) (270)
Unrealized (gain)/loss on derivative instruments (372) 5,283 (1,930)
Others, net     23
Changes in operating assets and liabilities:      
Trade receivables and unbilled revenue (14,822) (16,413) (1,630)
Other assets (17,340) (4,196) (2,137)
Trade payables (585) 2,029 (4,203)
Contract liabilities 8,714 (2,560) 2,303
Other liabilities 8,279 13,722 6,914
Cash generated from operating activities before interest and income taxes: 172,678 163,636 119,677
Income taxes paid (22,992) (27,265) (29,462)
Interest paid (2,521) (3,390) (84)
Interest received 2,489 3,327 2,004
Net cash provided by operating activities 149,654 136,308 92,135
Cash flows from investing activities:      
Restricted cash, held in escrow     (5,112)
Payment of contingent considerations in relation to acquisitions (6,922) (5,465)  
Proceeds from restricted cash, held in escrow   239 280
Government grant received   200  
Government grants repaid (200) (136)  
Payment for property and equipment and intangible assets (32,292) (33,684) (22,867)
Proceeds from sale of property and equipment 120 367 443
Investment in fixed deposits (27,899) (26,532) (24,672)
Proceeds from maturity of fixed deposits 31,336 30,698 15,112
Investment in marketable securities (long-term) (78,823)    
Marketable securities (short-term) sold / (purchased), net 42,037 (12,761) 32,413
Profit on sale of marketable securities (short-term) 1,497    
Dividends received 32 3,570 4,127
Investment in mutual funds   (52) (462)
Proceeds from maturity of fixed maturity plans ("FMPs")   100  
Net cash used in investing activities (71,347) (43,583) (131,267)
Cash flows from financing activities:      
Repurchase of shares (56,417) (39,546) (64,224)
Proceeds from exercise of stock options   1,347 8,941
Proceeds from long-term debt     118,000
Repayment of long-term debt (28,100) (28,100)  
Repayment of short-term borrowings, net     (475)
Payment of debt issuance cost   (354) (953)
Purchase of equity of non-controlling interest   (52)  
Excess tax benefit from share-based compensation expense 1,260 685 270
Net cash (used in)/provided by financing activities (83,257) (66,020) 61,559
Exchange difference on cash and cash equivalents (9,435) 3,321 5,522
Net change in cash and cash equivalents (14,385) 30,026 27,949
Cash and cash equivalents at the beginning of the year 99,829 69,803 41,854
Cash and cash equivalents at the end of the year 85,444 99,829 69,803
Non-cash transactions: Investing activities      
(i) Liability towards property and equipment and intangible assets purchased on credit 6,114 5,440 4,292
(ii) Contingent consideration payable towards acquisitions     19,678
(iv) Release of restricted cash, held in escrow 1,535 1,535  
MTS HealthHelp Inc. [member]      
Adjustments to reconcile profit after tax to net cash generated from operating activities:      
Reversal of contingent consideration in relation to acquisition of HealthHelp   (1,324)  
Cash flows from investing activities:      
Acquisition of subsidiaries and businesses, net of cash acquired     (56,674)
Adjustment towards acquisition   (573)  
Repayment of long-term debt of subsidiaries     (29,249)
Denali Sourcing Services Inc. [member]      
Cash flows from investing activities:      
Acquisition of subsidiaries and businesses, net of cash acquired     (31,886)
Adjustment towards acquisition   446  
Payment of contingent considerations in relation to acquisitions (2,484) (2,351)  
Non-cash transactions: Investing activities      
(iii) Liability towards deferred consideration     522
Financing activities      
(i) Short-term line of credit of Denali     475
Value Edge Research Services Private Limited [member]      
Cash flows from investing activities:      
Acquisition of subsidiaries and businesses, net of cash acquired     $ (12,720)
Non-cash transactions: Investing activities      
(iv) Release of restricted cash, held in escrow (1,535) $ (1,535)  
Hotel Beds Group SLU [member]      
Cash flows from investing activities:      
Acquisition of subsidiaries and businesses, net of cash acquired $ (233)