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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)