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Goodwill - Summary of Movement in Goodwill by Reportable Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance $ 134,008  
Impairment of goodwill recognized during the year 0 $ 21,673
Ending balance 135,186 134,008
Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance (21,673)  
Impairment of goodwill recognized during the year   21,673
Foreign currency translation (2,641)  
Ending balance (24,314) (21,673)
Accumulated impairment [member] | WNS Auto Claims BPM [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance (21,673)  
Impairment of goodwill recognized during the year   21,673
Foreign currency translation (2,641)  
Ending balance (24,314) (21,673)
Gross carrying value [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 155,681 76,242
Goodwill arising on acquisitions (92) 82,127
Foreign currency translation 3,911 (2,688)
Ending balance 159,500 155,681
Gross carrying value [member] | WNS global BPM [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 129,878 46,503
Goodwill arising on acquisitions (92) 82,127
Foreign currency translation 767 1,248
Ending balance 130,553 129,878
Gross carrying value [member] | WNS Auto Claims BPM [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 25,803 29,739
Foreign currency translation 3,144 (3,936)
Ending balance $ 28,947 $ 25,803