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Financial Instruments - Foreign Currency Risk from Non-derivative Financial Instruments (Detail) - Currency risk [member] - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Cash and cash equivalents | $ 5,073 | $ 9,074
Trade receivables | 185,501 | 185,010
Unbilled revenue | 17,660 | 18,118
Prepayments and other current assets | 1,018 | 729
Other non-current assets | 19 | 19
Trade payables | (120,423) | (116,213)
Provisions and accrued expenses | (4,969) | (2,983)
Pension and other employee obligations | (332) | (452)
Other liabilities | (10) | (11)
Net assets/ (liabilities) | 83,537 | 93,291
US Dollars [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Cash and cash equivalents | 1,204 | 399
Trade receivables | 100,713 | 100,002
Unbilled revenue | 4,576 | 7,178
Prepayments and other current assets | 522 | 428
Other non-current assets | 4 | 3
Trade payables | (28,704) | (27,613)
Provisions and accrued expenses | (2,924) | (2,314)
Pension and other employee obligations | (127) | (134)
Other liabilities | (2) | (7)
Net assets/ (liabilities) | 75,262 | 77,942
UK Pound Sterling [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Cash and cash equivalents | 263 | 4,735
Trade receivables | 48,198 | 46,658
Unbilled revenue | 3,553 | 3,209
Prepayments and other current assets | 311 | 188
Trade payables | (63,467) | (64,070)
Provisions and accrued expenses | (210) | (291)
Other liabilities | (7) | (4)
Net assets/ (liabilities) | (11,359) | (9,575)
Indian Rupees [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Trade receivables | 3,629 | 3,850
Prepayments and other current assets | 2 | 10
Trade payables | (8,332) | (6,989)
Provisions and accrued expenses | (217) | (205)
Net assets/ (liabilities) | (4,918) | (3,334)
Australian Dollars [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Cash and cash equivalents | 2,864 | 2,991
Trade receivables | 17,107 | 24,686
Unbilled revenue | 3,221 | 643
Prepayments and other current assets | 82 | 29
Trade payables | (9,059) | (16,093)
Provisions and accrued expenses | (1,069) |
Net assets/ (liabilities) | 13,146 | 12,256
Euro [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Cash and cash equivalents | 528 | 339
Trade receivables | 12,459 | 7,289
Unbilled revenue | 5,778 | 6,230
Prepayments and other current assets | 85 | 63
Trade payables | (10,265) | (1,429)
Provisions and accrued expenses | (477) | (154)
Pension and other employee obligations | (28) | (12)
Net assets/ (liabilities) | 8,080 | 12,325
Others Currencies [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Cash and cash equivalents | 214 | 610
Trade receivables | 3,395 | 2,525
Unbilled revenue | 532 | 858
Prepayments and other current assets | 16 | 11
Other non-current assets | 15 | 16
Trade payables | (596) | (19)
Provisions and accrued expenses | (72) | (19)
Pension and other employee obligations | (177) | (306)
Other liabilities | (1) |
Net assets/ (liabilities) | $ 3,326 | $ 3,676

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