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Financial Instruments - Foreign Currency Risk from Non-derivative Financial Instruments (Detail) - Currency risk [member] - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Cash and cash equivalents $ 9,074 $ 4,816
Trade receivables 185,010 187,312
Unbilled revenue 18,118 12,658
Prepayments and other current assets 729 671
Other non-current assets 19 19
Trade payables (116,213) (136,282)
Provisions and accrued expenses (2,983) (2,719)
Pension and other employee obligations (452) (252)
Other liabilities (11) 7
Net assets/ (liabilities) 93,291 66,230
US Dollars [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Cash and cash equivalents 399 599
Trade receivables 100,002 98,713
Unbilled revenue 7,178 4,656
Prepayments and other current assets 428 428
Other non-current assets 3 3
Trade payables (27,613) (40,600)
Provisions and accrued expenses (2,314) (1,706)
Pension and other employee obligations (134) (56)
Other liabilities (7) (5)
Net assets/ (liabilities) 77,942 62,032
United Kingdom Pound Sterling [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Cash and cash equivalents 4,735 253
Trade receivables 46,658 53,668
Unbilled revenue 3,209 1,241
Prepayments and other current assets 188 130
Trade payables (64,070) (71,039)
Provisions and accrued expenses (291) (504)
Other liabilities (4) (2)
Net assets/ (liabilities) (9,575) (16,253)
Indian Rupees [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade receivables 3,850 2,996
Prepayments and other current assets 10 3
Trade payables (6,989) (3,986)
Provisions and accrued expenses (205) (105)
Net assets/ (liabilities) (3,334) (1,092)
Australian Dollars [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Cash and cash equivalents 2,991 2,606
Trade receivables 24,686 23,373
Unbilled revenue 643 3,062
Prepayments and other current assets 29 66
Trade payables (16,093) (19,205)
Provisions and accrued expenses   (128)
Net assets/ (liabilities) 12,256 9,774
Euro [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Cash and cash equivalents 339 1,323
Trade receivables 7,289 5,370
Unbilled revenue 6,230 3,205
Prepayments and other current assets 63 30
Trade payables (1,429) (1,140)
Provisions and accrued expenses (154) (68)
Pension and other employee obligations (12) (31)
Net assets/ (liabilities) 12,325 8,689
Others Currencies [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Cash and cash equivalents 610 35
Trade receivables 2,525 3,192
Unbilled revenue 858 494
Prepayments and other current assets 11 14
Other non-current assets 16 16
Trade payables (19) (312)
Provisions and accrued expenses (19) (208)
Pension and other employee obligations (306) (165)
Other liabilities   14
Net assets/ (liabilities) $ 3,676 $ 3,080