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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:      
Profit $ 86,436 $ 37,763 $ 59,880
Adjustments to reconcile profit to net cash generated from operating activities:      
Depreciation and amortization 35,459 37,442 40,633
Impairment of goodwill   21,673  
Share-based compensation expense 30,565 23,036 17,919
Amortization of debt issue cost 488 52 13
Allowance for doubtful trade receivables (499) (1,040) (774)
Unrealized exchange loss/(gain), net 2,663 (11,123) 3,997
Current tax expense 24,494 25,785 19,615
Interest expense 3,778 495 265
Interest income (3,693) (2,083) (1,197)
Dividend income (3,570) (4,131) (5,039)
Unrealized gain on investments (3) (6) (41)
Income from funds held in escrow (239) (280)  
Reversal of contingent consideration in relation to acquisition (1,324)    
Loss/ (gain) on sale of property and equipment (325) 143 (100)
Deferred income taxes (9,063) (8,255) 1,565
Deferred rent 1,289 1,136 631
Excess tax benefit from share-based compensation expense (685) (270) (229)
Unrealized gain on derivative instruments 5,283 (1,930) (1,219)
Others, net   23 98
Changes in operating assets and liabilities:      
Trade receivables and unbilled revenue (16,413) (1,630) (5,725)
Other assets (4,196) (2,137) (9,162)
Trade payables 2,029 (4,203) (2,290)
Deferred revenue (2,560) 2,303 (1,050)
Other liabilities 13,722 6,914 6,532
Cash generated from operating activities before interest and income taxes: 163,636 119,677 124,322
Income taxes paid (27,265) (29,462) (22,472)
Interest paid (3,390) (84) (215)
Interest received 3,327 2,004 1,232
Net cash provided by operating activities 136,308 92,135 102,867
Cash flows from investing activities:      
Restricted cash, held in escrow   (5,112)  
Payment of contingent considerations in relation to acquisitions (5,465)    
Proceeds from restricted cash, held in escrow 239 280  
Government grant received 200    
Government grants repaid (136)    
Purchase of property and equipment and intangible assets (33,684) (22,867) (27,455)
Investment in mutual funds (52) (462)  
Marketable securities (purchased)/sold, net (12,761) 32,413 (29,616)
Proceeds from sale of property and equipment 367 443 329
Investment in fixed deposits (26,532) (24,672) (14,791)
Proceeds from maturity of fixed deposits 30,698 15,112 8,828
Dividends received 3,570 4,127 5,040
Proceeds from maturity of fixed maturity plans ("FMPs") 100   30,115
Net cash used in investing activities (43,583) (131,267) (30,122)
Cash flows from financing activities:      
Buyback of shares (39,546) (64,224) (30,461)
Proceeds from exercise of stock options 1,347 8,941 1,303
Proceeds from long term debt   118,000  
Payment of debt issuance cost (354) (953)  
Repayment of long term debt (28,100)   (13,163)
Repayments of short term borrowings, net   (475) (13,058)
Purchase of equity of non-controlling interest (52)    
Excess tax benefit from share-based compensation expense 685 270 229
Net cash (used in)/provided by financing activities (66,020) 61,559 (55,150)
Exchange difference on cash and cash equivalents 3,321 5,522 (8,189)
Net change in cash and cash equivalents 30,026 27,949 9,406
Cash and cash equivalents at the beginning of the year 69,803 41,854 32,448
Cash and cash equivalents at the end of the year 99,829 69,803 41,854
Non-cash transactions: Investing activities      
(i) Liability towards property and equipment and intangible assets purchased on credit 5,440 4,292 4,528
(ii) Contingent consideration payable towards acquisitions   19,678  
(iv) Release of restricted cash, held in escrow (1,535)    
MTS HealthHelp Inc. [member]      
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    
Non-cash transactions: Investing activities      
(iii) Liability towards deferred consideration   522  
Non-cash transactions: Financing activities      
(i) Short term line of credit   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)    
Telkom SA SOC Limited [member]      
Cash flows from investing activities:      
Acquisition of subsidiaries and businesses, net of cash acquired     $ (2,572)