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Operating Segments - Segment Results for Operating Segments (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Apr. 01, 2018
Disclosure of operating segments [Line Items] |  |  |  |
Revenue | $ 809,120 | $ 757,956 | $ 602,546 |
Payments to repair centers | 15,166 | 16,970 | 24,102 |
Revenue less repair payments (non-GAAP) | 793,954 | 740,986 | 578,444 |
Depreciation | 20,334 | 19,954 | 16,903 |
Other costs | 607,770 | 580,061 | 449,142 |
Impairment of goodwill | 0 | 0 | 21,673 |
Other income, net | (14,594) | (11,230) | (8,689) |
Finance expense | 3,204 | 4,264 | 547 |
Income tax expense | 25,719 | 15,431 | 17,530 |
Segment profit/(loss) | 151,521 | 132,506 | 81,338 |
Amortization of intangible assets | 15,783 | 15,505 | 20,539 |
Share-based compensation expense | 30,305 | 30,565 | 23,036 |
Profit after tax | 105,433 | 86,436 | 37,763 |
Addition to non-current assets | 31,807 | 32,538 | 111,733 |
Total assets, net of elimination | 785,630 | 759,563 | 704,123 | $ 765,158
Total liabilities, net of elimination | 233,211 | 264,607 | 289,057 | $ 264,675
External customers [member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Revenue | 809,120 | 757,956 | 602,546 |
Operating segments [member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Segment operating profit/(loss) | 165,850 | 140,971 | 90,726 |
Segment profit/(loss) before income taxes | 177,240 | 147,937 | 98,868 |
Operating segments [member] | WNS global BPM [member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Revenue | 774,309 | 722,600 | 557,983 |
Revenue less repair payments (non-GAAP) | 774,309 | 722,600 | 557,983 |
Depreciation | 20,130 | 19,682 | 16,598 |
Other costs | 588,289 | 561,870 | 429,074 |
Segment operating profit/(loss) | 165,890 | 141,048 | 112,311 |
Other income, net | (12,572) | (9,757) | (7,785) |
Finance expense | 3,204 | 4,065 | 547 |
Segment profit/(loss) before income taxes | 175,258 | 146,740 | 119,549 |
Income tax expense | 25,503 | 15,319 | 17,441 |
Segment profit/(loss) | 149,755 | 131,421 | 102,108 |
Addition to non-current assets | 29,583 | 32,337 | 111,280 |
Total assets, net of elimination | 667,261 | 633,186 | 590,974 |
Total liabilities, net of elimination | 156,298 | 181,627 | 214,155 |
Operating segments [member] | WNS global BPM [member] | External customers [member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Revenue | 774,235 | 722,542 | 557,904 |
Operating segments [member] | WNS Auto Claims BPM [member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Revenue | 34,885 | 35,414 | 44,642 |
Payments to repair centers | 15,166 | 16,970 | 24,102 |
Revenue less repair payments (non-GAAP) | 19,719 | 18,444 | 20,540 |
Depreciation | 204 | 272 | 305 |
Other costs | 19,555 | 18,249 | 20,147 |
Impairment of goodwill |  |  | 21,673 |
Segment operating profit/(loss) | (40) | (77) | (21,585) |
Other income, net | (2,022) | (1,473) | (904) |
Finance expense |  | 199 |  |
Segment profit/(loss) before income taxes | 1,982 | 1,197 | (20,681) |
Income tax expense | 216 | 112 | 89 |
Segment profit/(loss) | 1,766 | 1,085 | (20,770) |
Addition to non-current assets | 2,224 | 201 | 453 |
Total assets, net of elimination | 118,369 | 126,377 | 113,149 |
Total liabilities, net of elimination | 76,913 | 82,980 | 74,902 |
Operating segments [member] | WNS Auto Claims BPM [member] | External customers [member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Revenue | 34,885 | 35,414 | 44,642 |
Inter segments [member] |  |  |  |
Disclosure of operating segments [Line Items] |  |  |  |
Revenue | (74) | (58) | (79) |
Revenue less repair payments (non-GAAP) | (74) | (58) | (79) |
Other costs | $ (74) | $ (58) | $ (79) |

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