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Operating Segments - Segment Results for Operating Segments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of operating segments [Line Items]      
Revenue $ 757,956 $ 602,546 $ 562,179
Payments to repair centers 16,970 24,102 31,170
Revenue less repair payments (non-GAAP) 740,986 578,444 531,009
Depreciation 19,954 16,903 15,435
Other costs 580,061 449,142 399,613
Impairment of goodwill 0 21,673  
Other income, net (11,230) (8,689) (8,494)
Finance expense 4,264 547 278
Provision for income taxes 15,431 17,530 21,180
Segment profit/(loss) 132,506 81,338 102,997
Amortization of intangible assets 15,505 20,539 25,198
Share-based compensation expense 30,565 23,036 17,919
Profit/(loss) 86,436 37,763 59,880
Addition to non-current assets 32,538 111,733 31,858
Total assets, net of elimination 759,563 704,123 525,451
Total liabilities, net of elimination 264,607 289,057 117,262
External customers [member]      
Disclosure of operating segments [Line Items]      
Revenue 757,956 602,546 562,179
Operating segments [member]      
Disclosure of operating segments [Line Items]      
Segment operating profit/(loss) 140,971 90,726 115,961
Segment profit/(loss) before income taxes 147,937 98,868 124,177
Operating segments [member] | WNS global BPM [member]      
Disclosure of operating segments [Line Items]      
Revenue 722,600 557,983 509,268
Revenue less repair payments (non-GAAP) 722,600 557,983 509,268
Depreciation 19,682 16,598 15,090
Other costs 561,870 429,074 377,051
Segment operating profit/(loss) 141,048 112,311 117,127
Other income, net (9,757) (7,785) (7,461)
Finance expense 4,065 547 278
Segment profit/(loss) before income taxes 146,740 119,549 124,310
Provision for income taxes 15,319 17,441 20,905
Segment profit/(loss) 131,421 102,108 103,405
Addition to non-current assets 32,337 111,280 30,757
Total assets, net of elimination 633,186 590,974 373,195
Total liabilities, net of elimination 181,627 214,155 36,660
Operating segments [member] | WNS global BPM [member] | External customers [member]      
Disclosure of operating segments [Line Items]      
Revenue 722,542 557,904 508,864
Operating segments [member] | WNS Auto Claims BPM [member]      
Disclosure of operating segments [Line Items]      
Revenue 35,414 44,642 53,315
Payments to repair centers 16,970 24,102 31,170
Revenue less repair payments (non-GAAP) 18,444 20,540 22,145
Depreciation 272 305 345
Other costs 18,249 20,147 22,966
Impairment of goodwill   21,673  
Segment operating profit/(loss) (77) (21,585) (1,166)
Other income, net (1,473) (904) (1,033)
Finance expense 199    
Segment profit/(loss) before income taxes 1,197 (20,681) (133)
Provision for income taxes 112 89 275
Segment profit/(loss) 1,085 (20,770) (408)
Addition to non-current assets 201 453 1,101
Total assets, net of elimination 126,377 113,149 152,256
Total liabilities, net of elimination 82,980 74,902 80,602
Operating segments [member] | WNS Auto Claims BPM [member] | External customers [member]      
Disclosure of operating segments [Line Items]      
Revenue 35,414 44,642 53,315
Inter segments [member]      
Disclosure of operating segments [Line Items]      
Revenue (58) (79) (404)
Revenue less repair payments (non-GAAP) (58) (79) (404)
Other costs $ (58) $ (79) $ (404)